THESE NOTES ARE PREPARED ACCORDING TO JKBOSE SYLLABI IN SIMPLIFIED AND CONCISE PATTERN
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Unit: Chemical Reactions and Equations
Q. Which of following is not a chemical change?
A. Burning of magnesium in air
B. Digestion of food in our body
C. Melting of Ice
D. Turning brown of a freshly cut apple.
Ans: C. Melting of Ice
Q. Write the balanced equation for reaction involving decomposition of calcium carbonate into calcium oxide and carbon dioxide?
Ans: The chemical equation is as follows;
CaCO3(s)→CaO(s)+CO2(g)
Q. Barium chloride reacts with sodium sulphate to form barium sulphate and sodium chloride,
BaCl2 + Na2SO4 _____> BaSO4 + NaCl
The above reaction is an example of:
A. Combination reaction
B. Decomposition reaction
C. Displacement reaction
D. Double displacement reaction
Ans: D. Double displacement reaction.
Q. Write a balanced chemical equation for a reaction involving the combination between hydrogen and chlorine to form hydrogen chloride.
Ans:
The balanced equation is:
H2 (g) +Cl2 (g) →2HCl (g)
Q. Write a balanced chemical equation for the reaction involving displacement of hydrogen from sulphuric acid by zinc to form zinc sulphate and hydrogen gas.
Ans: The balanced equation is;
Zn(s) + H2SO4(aq) —-> ZnSO4(aq) + H2(g)
Q. When the calcium carbonate is heated, ut gives calcium oxide and carbon dioxide.
CaCO3 ______> CaO + CO2
This reaction is an example of :
A. Combination reaction
B. Decomposition reaction
C. Displacement reaction
D. Double displacement reaction
Ans: B. Decomposition reaction
Q. Which of the statements about the reaction below are incorrect?
2PbO (s) + C (s) ------------> 2Pb (s) + CO2 (g)
a.) Lead is getting ready.
b.) Carbon dioxide is getting oxidised.
c.) Carbon is getting oxidised.
d.) Lead oxide is being reduced.
Answer:- a and b
Lead is getting reduced and
Carbon dioxide is getting oxidised.
Q. Fe2O3 + 2Al -----------> AlO3 + 2Fe.
The above reaction is an example of a;
a.) combination reaction.
b.) double displacement reaction
c.) decomposition reaction
d.) displacement reaction
Answer:- Displacement reaction.
Q. Formation of CuO from copper and oxygen denotes;
a.) Reduction
b.) Oxidation
c) Redox reaction
d.) None of these
Answer:- Reduction
Q. Which of the following is not a chemical reaction?
a.) Souring of milk
b.) Dissolution of sugar in water
c.) Rusting of iron
d.) Digestion of food
Ans.:- Dissolution of sugar in water.
Q. which of the following methods is suitable for preventing an iron frying pan from rusting?
a.) Reduction
b.) Oxidation
c) Redox reaction
d.) None of these
Answer:- Reduction
Q. Which of the following is not a chemical reaction?
a.) Souring of milk
b.) Dissolution of sugar in water
c.) Rusting of iron
d.) Digestion of food
Ans.:- Dissolution of sugar in water.
Q. which of the following methods is suitable for preventing an iron frying pan from rusting?
a.)Applying grease
b.) Applying paint
c.) Applying coating of zinc
d.) All of these.
Ans:- Applying coating of zinc.
Q. The correct formula of rust is;
a.) Fe2O3
b.) Fe3O4
c.) Fe2O3 xH2O
d.) Fe3O4 xH20
Ans.:- Fe2O3--xH20
Q. Rancidity occurs when oils and fats are;
b.) Applying paint
c.) Applying coating of zinc
d.) All of these.
Ans:- Applying coating of zinc.
Q. The correct formula of rust is;
a.) Fe2O3
b.) Fe3O4
c.) Fe2O3 xH2O
d.) Fe3O4 xH20
Ans.:- Fe2O3--xH20
Q. Rancidity occurs when oils and fats are;
a.) Oxidation b.) Reduced
c.) Decomposed d.) None
Ans:-Oxidised
Q. when lime stone is heated, the chemical reaction that takes place;
a.) Decomposition b.) Combination
c.) Electrolysis d.) Displacement.
Ans: Decomposition
Q. 2KClO3 ----------------> 2KCl + 3O2 is a;
a.) Decomposition reaction
b.) Combination reaction
c.) Displacement rection
d.) Isomerisation reaction
Ans:--- Decomposition reaction
Q. Rusting is ;
a.) Reducing reaction
b.) Decomposition reaction
c.) Oxidation reaction
d.) Redox reaction
Ans:--- Redox reaction
Q. The reaction in which heat energy is given out is called;
a.) Endothermic b.) Exothermic
c.) Isomerisation d.) None
c.) Decomposed d.) None
Ans:-Oxidised
Q. when lime stone is heated, the chemical reaction that takes place;
a.) Decomposition b.) Combination
c.) Electrolysis d.) Displacement.
Ans: Decomposition
Q. 2KClO3 ----------------> 2KCl + 3O2 is a;
a.) Decomposition reaction
b.) Combination reaction
c.) Displacement rection
d.) Isomerisation reaction
Ans:--- Decomposition reaction
Q. Rusting is ;
a.) Reducing reaction
b.) Decomposition reaction
c.) Oxidation reaction
d.) Redox reaction
Ans:--- Redox reaction
Q. The reaction in which heat energy is given out is called;
a.) Endothermic b.) Exothermic
c.) Isomerisation d.) None
Ans:--- Exothermic reaction
Q. Consider the reaction
Q. Consider the reaction
KBr + AgNO3-------->KNO3+ AgBr
Which reaction is it?
Which reaction is it?
a.) Decomposition reaction
b.) Double decomposition reaction
c.) Combination reaction
d.) Displacement reaction
Ans:--- Double decomposition reaction
Q. Which is an exothermic reaction?
a.) C+O2 -------> CO2 +394 KJ
b.) N2 + O2 --------> 2NO +330 KJ
c.) CaCO3----------> CaO + CO2-- Heat
d.) None of these.
Ans:--- C+ O2------> CO2 + 394 KJ
Q. ZnO +C -------> Zn + CO
The above given reaction is an example of;
a.) Oxidation b.) Reduction
c.) Redox Reaction d.) Combination reaction
Ans:- Redox reaction
Ans:
sunlight
2AgCl(s) ----------------> 2Ag (s)+Cl2(g)
Q. Which of following processes involves chemical reactions?
a. Storing oxygen gas under high pressure
b. Liquification of air
c. Keeping petrol in china dish in open
d. Heating copper wire in presence of air
Ans: D: Heating copper wire in presence of air.
Q. Assertion: When zinc is dipped in copper sulphate solution, reddish brown particles at the botton
Reason: Zinc displaces copper to form zinc sulphate, and reddish brown particles of copper settle at bottom
Ans: Both are correct, and R is correct explanation of A.
Q. Assertion: When silver bromide is exposed to sunlight, it changes its colour from light yellow to grey
Reason: Silver bromide burns and becomes grey.
Ans: Assertion is true but reason is false.
Q. Assertion: If any food item containing oil or fat is left for a long time, it develops a bad taste and bad smell.
Reason: Food item undergoes decomposition to produce gases that result in bad smell.
Ans: Assertion is true but reason is false.
b.) Double decomposition reaction
c.) Combination reaction
d.) Displacement reaction
Ans:--- Double decomposition reaction
Q. Which is an exothermic reaction?
a.) C+O2 -------> CO2 +394 KJ
b.) N2 + O2 --------> 2NO +330 KJ
c.) CaCO3----------> CaO + CO2-- Heat
d.) None of these.
Ans:--- C+ O2------> CO2 + 394 KJ
Q. ZnO +C -------> Zn + CO
The above given reaction is an example of;
a.) Oxidation b.) Reduction
c.) Redox Reaction d.) Combination reaction
Ans:- Redox reaction
Q. In presence of sunlight, Silver chloride decomposes to give silver and chlorine gas. Write a balanced chemical equation for it?
Ans:
sunlight
2AgCl(s) ----------------> 2Ag (s)+Cl2(g)
Q. Which of following processes involves chemical reactions?
a. Storing oxygen gas under high pressure
b. Liquification of air
c. Keeping petrol in china dish in open
d. Heating copper wire in presence of air
Ans: D: Heating copper wire in presence of air.
Q. Assertion: When zinc is dipped in copper sulphate solution, reddish brown particles at the botton
Reason: Zinc displaces copper to form zinc sulphate, and reddish brown particles of copper settle at bottom
Ans: Both are correct, and R is correct explanation of A.
Q. Assertion: When silver bromide is exposed to sunlight, it changes its colour from light yellow to grey
Reason: Silver bromide burns and becomes grey.
Ans: Assertion is true but reason is false.
Q. Assertion: If any food item containing oil or fat is left for a long time, it develops a bad taste and bad smell.
Reason: Food item undergoes decomposition to produce gases that result in bad smell.
Ans: Assertion is true but reason is false.
Q. What do you mean by exothermic reaction? Give one example
Ans: Exothermic reaction is a type of reaction in which heat is given out. In other words energy is produced. E.g
C + O -------------> CO2
C6H12O6 + 6O2 ------Ã 6CO2 + 6H2O
Q. What do you mean by Endothermic reaction? Give one example
Ans: Endothermic reaction is a type of reaction in which heat is absorbed. In other words energy is needed for reaction to take place. E.g
N2 + O2 -----------> 2NO
6CO2 + 6 H2O ----Ã C6H12O6 + O2
Q. What is balanced chemical equation? Why should chemical equations be balanced?
Ans: A balanced equation is a chemical equation which has equal number of atoms in reactants as well as products. The chemical equation needs to be balanced so that it follows the law of conservation of mass.
Q. Iron displaces copper from the copper sulphate solution to form iron sulphate. Write a balanced chemical equation for this reaction.Ans: Fe+CuSO4→Cu+FeSO4
Q. Reaction of Zinc with dilute Sulphuric acid is:
A. Displacement reaction as well as Redox reaction
B. Precipitation reaction as well as Redox reaction
C. A redox reaction as well as Double displacement reaction
D. A decomposition reaction as well as combination reaction.
Ans: A. Displacement reaction as well as Redox reaction
Q. Assertion: When we mix the solution of sodium sulphate and barium chloride, White precipitate is formed.
Reason: The white precipitate of barium sulphate and that is formed by the reaction of SO4 2- and Ba2+
(a) Both, A and R, are true and R is the correct explanation of A
(b) Both, A and R, are true but R is not the correct explanation of A
(c) If A is true but R is false
(d) If A is false but R is true
Ans: (a) Both, A and R, are true and R is the correct explanation of A
Q. Translate the following statements into chemical equations and balance them:
i. Hydrogen gas combines with nitrogen to form ammonia
Ans: 3H2 + N2 → 2NH3
ii. Barium chloride reacts with aluminium sulphate to give aluminium chloride and barium sulphate.
Ans: BaCl2 +Al2(SO4)3 → AlCl3 +BaSO4
iii. Potassium metal reacts with water to give potassium hydroxide and hydrogen gas
Ans: 2K +2H2O → 2KOH +n H2
Q. An element reacts with oxygen to give a compound with a high melting point. The compound is soluble in water. The element is likely to be:
a. Calcium b. Carbon c. Silicon d. Iron
Ans: Calcium
Hint: Calcium reacts with oxygen to form calcium oxide (CaO), Also called Quick Lime.
Q. A student performs an experiment to form aluminium
chloride from aluminium and chlorine. Which of the following option gives the
chemical equation of the reaction.
b) 2Al +3Cl, > 2AICl,
c) 2Al + CI2 -> 2AICI
d) 3Al +3Cl3 -> 3AICI3
Ans: d) 3Al +3Cl3 -> 3AICI3
Q. Which of the following reaction is used in black and
white photography.
Ans: c) Decomposition reaction
Q. CuO (s) + H2 (g) -> Cu (s) + H2O (l), In this reaction:
a. Cu is an oxidising agent b. H20 is reducing agent
c. CuO is oxidizing agent d. Both CuO and H2 are oxidizing agent
Ans: c. CuO is oxidizing agent
Q. 4 Na(s) + O2 (g) -> 2 Na2O (s), In this reaction,
a. Sodium gets reduced b. Sodium oxide gets reduced
c. Sodium oxide gets oxidized d. Sodium gets oxidized
Ans: d. Sodium gets oxidized
Q. An element reacts with oxygen to give a compound with a high melting point. The compound is also soluble in water. The element is likely to be:
a. Calcium b. Carbon d. Silicon d. Iron
Ans: a. Calcium
Hint: Calcium reacts with oxygen to form Calcium oxide (Quick Lime). It has high melting point and is soluble in water.
Q. Which of the following pairs will give displacement reaction?
a. NaCl solution and copper metal b. MgCl2 solution and aluminium metal
c. FeSO4 solution and Silver metal d. AgNO3 solution and Copper metal
Ans: d. AgNO3 solution and Copper metal
Q. Fe2O3 + 2 Al -> Al2O3 + 2Fe, The reaction is an example of:
a. Combination reaction b. Displacement Reaction
c. Double Displacement reaction d. Decomposition reaction
Ans: b. Displacement Reaction
Unit: Periodic Classification Of Elements
Q. The modern periodic table was prepared by:
A. Dobereiner B. Bohr C. Mendeleev D. Newlands
Ans: B. Bohr
Q. The newlands law of octaves for the classification of elements was found to be applicable only upto the element:
a. Potassium b. Calcium c. Cobalt d. Phosphorus
Ans: b. Calcium
Q. The noble gas having only two electrons in its valence shell is
a. Argon b. Neon c. Helium d. Krypton
Ans: c. Helium
Q. In Mendeleev’s periodic table, gap was not left for one of the following elements. This element is:
a. Gallium b. Beryllium c. Germanium d. Scandium
Ans: b. Beryllium
Q. The electrons present in the valance shell of a noble gas atom can be:
a. 8 only b. 2 only c. 8 or 4 d. 8 or 2
Ans: d. 8 or 2
Q. On moving from left to right in a period of periodic table, atomic number of elements increases. With the increase in atomic number along a period, the atomic size
A. Increases
B. Decreases
C. First increase then decrease
D. Remains same
Ans: B. Decreases
Q. On moving from left to right in a periodic table, the metallic character;
A. Increases
B. Decreases
C. First increase then decrease
D. Remains same
Ans: B. Decreases
Q. An element having electronic configuration 2, 8, 2 is a
A. Metal
B. Non metal
C. Metalloid
D. None
Ans: A. Metal
Q. On moving down the group, the atomic size:
A. Increases
B. Decreases
C. Remains same
D. None of these
Ans: A. Increases
Q. Which property among the following shows regular variation on moving down the group or along the period?
A. Atomic size
B. Valency
C. Metallic character
D All of the above
Ans: A. Atomic size
Q. Which element among the following has highest atomic radius
A. Sodium Na
B. Magnesium Mg
C. Pottasium K
D. Calcium Ca
Ans: D. Calcium Ca
Q. Which among the following gives correct increasing order of the atomic radii of O, F and N
A. O, F, N
B. N, F, O
C. O, N, F
D. F, O, N
Ans: D. F, O, N
Clarification: F is fluorine, O is oxygen, N is nitrogen.
Q. Write the arrangement of Alkali metals in decreasing order of metallic character.
Ans: Cesium is more metallic than Rubidium which is more metallic than Pottasium. Pottasium is more metallic than sodium which is more metallic than lithium.
Cs > Rb > K > Na > Li
Q. Which among the following is most electronegative element among following;
A. Fluorine B. Chlorine C. Bromine D. Iodine
Ans: A. Fluorine
Q. In moving down the group in a periodic table, the non metallic character of element,
A. Increases
B. Decreases
C. First increase then decrease
D. None of above
Ans: B. Decreases
Hint: Nonmetallic character decreases but metallic character increases.
Q. The repetition of properties of elements after certain regular intervals is called 'periodicity of properties'. According to modern periodic law, the periodicity in properties is due to periodicity in their:
A. Atomic masses
B. Atomic numbers
C. Electronic configuration of outer shell
D. Both A and B
Ans: B. Atomic numbers
Q. All the elements in particular group of modern periodic table show similar chemical properties. This similarity in properties in because :
A. They have similar number of shells
B. They have similar mass number
C. They have similar electronic configuration
D. They have similar atomic size
Ans: C. They have similar electronic configuration
Q. On moving from left to right of a periodic table, the atomic number increases and the number of shells
A. Also increase
B. Remains same
C. Decrease
D. First increase then decrease
Ans: B. Remains same
Q. When we go down the group in periodic table, there is gradual change in
A. Chemical properties only
B. Physical properties only
C. Both physical and chemical properties
D. None of these
Ans: B. Physical properties only
Clarification: Both Physical and chemical properties may change in certian groups.
Q. An element having the electronic configuration of 2, 8, 8, 18, 7 belongs to
A. Alkali metals
B. Chalcogens
C. Halogens
D. Noble gases
Ans: C. Halogens
Q. Which arrangement of metals among the following shows the increasing order of reactivity?
A. Gold < Pottasium < Copper < Aluminium
B. Pottasium < Aluminium < Copper < Gold
C. Copper < Gold < Aluminium < Pottasium
D. Gold < Copper < Aluminium < Pottasium
Ans: B. Pottasium < Aluminium < Copper < Gold
Q. Which of the following shows no corrosion?
a.) Iron b.) Copper
c.) Gold d.) None of these
Ans:- Gold
Q. During galvanisation, iron metal is given coating of the following metal. The metal is;
a.) Cr b.) Br c.) Zn d.) Cu
Ans:--- Zn
Q. Oxidation is a process in which a substance;
a.) Gains electrons
b.) Gains oxygen
c.) Loses electrons
d.) None of these.
Ans:- Loses electrons
Q. Cl2 + 2Kl ---------> 2KCl +l2 is;
a.) Combination reaction
b.) Decomposition reaction
c.) Double decomposition reaction
d.) Displacement reaction
Ans:---- Displacement reaction
Q. Name two elements you would expect to show same kind of chemical reactivity as magnesium.
Ans:--calcium and strontium.
Q. Name three elements that have only a single electron in their outermost shells.
Ans:-- Lithium, Sodium and Potassium.
Q. Name two elements that have two electrons in their outermost shells.
Ans:-- Magnesium and Calcium.
Q.. Name three elements with filled outermost shells.
Ans:-- Neon, Argon and Krypton.
Q. In the modern periodic table, of the first ten elements, which are metals?
Ans:-- Lithium and Beryllium.
Q. Element X forms a chloride with the formula XCl2, which is a solid. X would most likely be in the same group of the periodic table as;
a. Na b. Mg c. Al d. Si
Ans:--- Mg
Q. which element has 2 shells , both of which are completely filled with electrons?
Ans:--- Neon.
Q. which element has the electronic configuration 2,8,2?
Ans:---Magnesium.
Q. which element has a total of three shells, with four electrons in its valence shell?
Ans:-- Silicon
Q. which element has a total of two shells, with three electrons in its valence shell?
Ans:-- Boron.
Q. Which element has twice as many electrons in its second shell as in its first shell?
Ans:-- Carbon.
Q. What property do all elements in the same column of the periodic table like boron have in common?
Ans:--- All elements of this column have 3 electrons in their valence shell like Boron.
Q. An atom has electronic configuration 2,8,7.
a.) What is the atomic number of this element?
Ans:-- 17.
b.) To which of the following element would it be chemically similar?
N(7), F(9),P(15) , Ar(18)
Ans:-- F(9)(2,7)
Q. The inert gas among the following is;
a.) Ar b.) K c.) Ca d.) Cl
Ans:--- Ar.
Q. The law of Triads was given by;
a.) Newlands b.) Mendeleev
c.) Moseley d.) Dobereiner
Ans:--- Dobereiner.
Q. Modern periodic table has;
a.) 8 groups b.) 18 groups
c.) 7 groups d.) None of these.
Ans:--- 18 Groups.
Q. In Mendleeve's periodic table, the properties of elements are a periodic function of their;
a.) Atomic size b.) Atomic mass
c.) Ionisation energy d.) Atomic number
Ans:-- Atomic mass
Q. Number of periods in modern periodic table is;
a.) 5 b.) 6 c.) 7 d.) 8
Ans:--- 7
Q. Number of groups and periods present in modern periodic table are;
a.) 16, 7 b.) 6, 16 c.) 18,7 d.) 18,6
Ans:-- 18,7
Q. Which of the following is least reactive alkali metal?
a.) Li b.) K c.) Na d.) Rb
Ans:--- Li
Q. As we move down the group, the atomic size;
a.) Increases b.) decreases
c.) remains constant d.) None of these.
Ans:---- increases.
Q. Element X forms a chloride with the formula XCl2, which is a solid. X would most likely be in the same group of the periodic table as;
a. Na b. Mg c. Al d. Si
Ans:--- Mg
Q. which element has 2 shells , both of which are completely filled with electrons?
Ans:--- Neon.
Q. which element has the electronic configuration 2,8,2?
Ans:---Magnesium.
Q. which element has a total of three shells, with four electrons in its valence shell?
Ans:-- Silicon
Q. which element has a total of two shells, with three electrons in its valence shell?
Ans:-- Boron.
Q. Which element has twice as many electrons in its second shell as in its first shell?
Ans:-- Carbon.
Q. What property do all elements in the same column of the periodic table like boron have in common?
Ans:--- All elements of this column have 3 electrons in their valence shell like Boron.
Q. An atom has electronic configuration 2,8,7.
a.) What is the atomic number of this element?
Ans:-- 17.
b.) To which of the following element would it be chemically similar?
N(7), F(9),P(15) , Ar(18)
Ans:-- F(9)(2,7)
Q. The inert gas among the following is;
a.) Ar b.) K c.) Ca d.) Cl
Ans:--- Ar.
Q. The law of Triads was given by;
a.) Newlands b.) Mendeleev
c.) Moseley d.) Dobereiner
Ans:--- Dobereiner.
Q. Modern periodic table has;
a.) 8 groups b.) 18 groups
c.) 7 groups d.) None of these.
Ans:--- 18 Groups.
Q. In Mendleeve's periodic table, the properties of elements are a periodic function of their;
a.) Atomic size b.) Atomic mass
c.) Ionisation energy d.) Atomic number
Ans:-- Atomic mass
Q. Number of periods in modern periodic table is;
a.) 5 b.) 6 c.) 7 d.) 8
Ans:--- 7
Q. Number of groups and periods present in modern periodic table are;
a.) 16, 7 b.) 6, 16 c.) 18,7 d.) 18,6
Ans:-- 18,7
Q. Which of the following is least reactive alkali metal?
a.) Li b.) K c.) Na d.) Rb
Ans:--- Li
Q. As we move down the group, the atomic size;
a.) Increases b.) decreases
c.) remains constant d.) None of these.
Ans:---- increases.
Q. How many elements were known when Mendeleev groupes his periodic table?
a.) 36 b.) 56 c.) 115 d.) 63
Ans:-- 63
Q. Modern periodic table was given by;
a.) Mendeleev b.) Moseley
c.) Newlands d.) None of these.
Ans:-- Moseley
Q. Mendeleev placed Iron in;
a.) Group 3 b.) Group 8
c.) Group 7 d.) Group 1
Ans:--- Group 8
Q. Halogens lie in the modern periodic table in;
a) Group 17 b.) Group 7
c.) Group 16 d.) Group 18
Ans:-- Group 17
Q. Modern periodic table is based upon;
a.)Modern periodic law
b.) Mendeleev's periodic law
c.) Atomic weight
d.) None
Ans:-- Modern Periodic law
Q. which among the following is the most reactive;
a.) potassium b.) sodium
c.) calcium d.) Magnesium
Ans:--- Sodium
Q. An atom of the element whose first shell is complete and has no other shell, the atom is;
a.)Sodium b.) Helium
c.) Chlorine d.) Hydrogen
Ans:-- Helium
a.) 36 b.) 56 c.) 115 d.) 63
Ans:-- 63
Q. Modern periodic table was given by;
a.) Mendeleev b.) Moseley
c.) Newlands d.) None of these.
Ans:-- Moseley
Q. Mendeleev placed Iron in;
a.) Group 3 b.) Group 8
c.) Group 7 d.) Group 1
Ans:--- Group 8
Q. Halogens lie in the modern periodic table in;
a) Group 17 b.) Group 7
c.) Group 16 d.) Group 18
Ans:-- Group 17
Q. Modern periodic table is based upon;
a.)Modern periodic law
b.) Mendeleev's periodic law
c.) Atomic weight
d.) None
Ans:-- Modern Periodic law
Q. which among the following is the most reactive;
a.) potassium b.) sodium
c.) calcium d.) Magnesium
Ans:--- Sodium
Q. An atom of the element whose first shell is complete and has no other shell, the atom is;
a.)Sodium b.) Helium
c.) Chlorine d.) Hydrogen
Ans:-- Helium
Q. Arrange following metals in increasing order of their reactivity?
Copper, Aluminium, Silver, Zinc, Iron
Ans:
1.Aluminium
2. Zinc
3. Iron
4. Copper
5. Silver
Q. Which of following metals will be displaced from the solution of its salts by other three?
A. Magnesium
B. Silver
C. Zinc
D. Copper
Ans: B. Silver
Copper, Aluminium, Silver, Zinc, Iron
Ans:
1.Aluminium
2. Zinc
3. Iron
4. Copper
5. Silver
Q. Which of following metals will be displaced from the solution of its salts by other three?
A. Magnesium
B. Silver
C. Zinc
D. Copper
Ans: B. Silver
Q. The distance between the centre of nucleus and the outermost shell is called atomic size. On moving from left to right in a period of periodic table, atomic size of the elements
a. Increases b. Decreases
c. Same d. First increase then decreases
Ans: B. Decreases
Q. On moving down the group in a periodic table, metallic character of elements:
a. Increases b. Decreases
c. Same d. First increase then decreases
Ans: . A. Increases
Q. F, Cl, Br and I belong to halogen family. All of them are electronegative. Which among these has highest electronegativity?
A. Flourine B. Chlorine
C. Bromine D. Iodine
Ans: A. Flourine
Q. When we go down the group in a periodic table, a new shell of electrons is added at eaach succeeding element. So what happens to the valency of elements down the group?
A. Increases
B. Decreases
C. Increases then decreases
D. Remains same
Ans: D. Remains same
Q. When we go down the group in a periodic table,
A. Only physical properties show variation
B. Only chemical properties show variation
C. Both show variation
D. Properties remain same
Ans: C: Both show variation
a. Increases b. Decreases
c. Same d. First increase then decreases
Ans: B. Decreases
Q. On moving down the group in a periodic table, metallic character of elements:
a. Increases b. Decreases
c. Same d. First increase then decreases
Ans: . A. Increases
Q. F, Cl, Br and I belong to halogen family. All of them are electronegative. Which among these has highest electronegativity?
A. Flourine B. Chlorine
C. Bromine D. Iodine
Ans: A. Flourine
Q. When we go down the group in a periodic table, a new shell of electrons is added at eaach succeeding element. So what happens to the valency of elements down the group?
A. Increases
B. Decreases
C. Increases then decreases
D. Remains same
Ans: D. Remains same
Q. When we go down the group in a periodic table,
A. Only physical properties show variation
B. Only chemical properties show variation
C. Both show variation
D. Properties remain same
Ans: C: Both show variation
A. Dobereiner’s triads B. Newlands law of Octaves
C. Mendeleev’s PT D. Modern PT
Ans: Mendeleev’s PT
Q. Which among the following is considered as the limitation of Mendeleev’s periodic table?
A. Prediction of New Elements B. Correction of atomic masses
C. Position of isotopes D. Both A and B
Ans: C. Position of isotopes
Q. Which of the following statements is not a correct statement about the trends when going from left to right across the periods of the Modern Periodic table?
A. The elements become less metallic B. The number of valance electrons increases
C. The atoms loose electrons more easily D. The oxides become more acidic
Ans: C. The atoms loose electrons more easily
Q. Arrange the following elements in the order of their decreasing metallic character:
Sodium Na, Silicon Si, Chlorine Cl, Magnesium Mg, Aluminium Al.
Ans: Since Metallic character decreases from Left to Right, Therefore,
Sodium Na > Magnesium Mg > Aluminium Al > Silicon Si > Chlorine Cl.
Unit : Carbon And Its Compounds
Q. Name the functional group which always occurs at the middle of carbon chain.
Ans: The Ketone is always present at the middle of carbon chain.
Q. Why does ethyne burn with a sooty flame?
Ans: When ethyne is burned in air, it does not get completely oxidised, thereby producing a sooty flame.
Q. What is the common name of Methanol
Ans: Spirit or Methyl Alcohol
Q. Name the product formed when hydrogen is added to ethene.
Ans: When Hydrogen is added to Ethene, Ethane is formed.
Q. Name a covalent molecule having a double bond between its atoms.
Ans: Oxygen (O2)
Q. What is the common name of Propanone?
Ans: Acetone.
Q. Name the gas evolved when ethanoic acid is added to sodium carbonate
Ans: When ethanoic acid is added to Sodium carbonate, Carbon dioxide is formed.
Q. Since the general formula of carboxylic acid is Cn H 2n+1 COOH. Name the carboxylic acid if n=1 and write its molecular formula.
Ans: Cn H 2n+1 COOH forms CH3COOH. Its name is ethanoic acid. It is also called as acetic acid.
Q. From an alkane containing two carbon atoms, one hydrogen atom is replaced by a hydroxyl group to form a new compound. Name the newly formed compound and write its molecular formula.
Ans: An Alkane containing two carbon atoms is Ethane (C2H6).
When one Hydrogen atom of Ethane is replaced by hydoxyl group, it forms C2H5OH.
C2H5OH is also called as ethanol.
Ans: Cn H 2n+1 COOH forms CH3COOH. Its name is ethanoic acid. It is also called as acetic acid.
Q. From an alkane containing two carbon atoms, one hydrogen atom is replaced by a hydroxyl group to form a new compound. Name the newly formed compound and write its molecular formula.
Ans: An Alkane containing two carbon atoms is Ethane (C2H6).
When one Hydrogen atom of Ethane is replaced by hydoxyl group, it forms C2H5OH.
C2H5OH is also called as ethanol.
Q. From alkane with 3 carbon atoms , 1 hydrogen atom is replaced by Chlorine to form new compound. Name the newly formed compound and write its molecular formula
Ans: An Alkane with 3 carbon atoms is Propane (C3H8).
If one hydrogen atom is replaced by chlorine, it forms ChloroPropane.
The molecular formula of ChloroPropane is C3H7Cl.
Q. Homologus series is a family of organic compounds having same functional group. Give the formulae of first three homologues of carboxylic acids.
Ans: The first three carboxylic acids are;
1. Methanoic acid (HCOOH),
2. Ethanoic acid (CH3COOH),
3. Propanoic acid (C2H5COOH)
Q. Name the part of soap molecule that is hydrophilic.
Ans: The ionic oart of soap molecule i.e C=O_O-Na is hydrophilloc in nature.
Q. Ethane, with the molecular formula C2H6 has;
a.) 6 covalent bonds b.) 7 covalent bonds
c.) 8 covalent bonds d.) 9 covalent bonds
Ans:-- 7 covalent bonds.
Q. Butanone is a four- carbon compound with the functional group;
a.) carboxylic acid b.) aldehyde
c.) ketone d.) alcohol
Ans:-- ketone.
Q. While cooking, if the bottom of vessel is getting black on the outside, it means that:
a. The food is not cooker properly
b. The fuel is not burned properly
c. The fuel is wet
d. The fuel is burning completely
Ans: b. The fuel is not burned properly
Q. which of the following types of medicines are used for treating in digestions?
a.) Antibiotic b.) Analgesic
c.) Antacid d.) Antiseptic
Ans:--- Antacid.
Q. Carboxylic acid group is present in one of the following;
a.) Propanone b.) Acetaldehyde
c.) Ethanoic acid d.) Hydrochloric acid
Ans:-- Ethanoic acid.
Q. Vinegar is;
a.) 25% acetic acid b.) 6- 8% acetic acid
c.) pure acetic acid d.) 50% acetic acid
Ans:-- 6- 8% acetic acid
Q. Aldehyde group is present in one of the following;
a.) Propanone b.) Acetaldehyde
c.) Ethanoic acid d.) Hydrochloric acid
Ans:-- Acetaldehyde.
Ans: An Alkane with 3 carbon atoms is Propane (C3H8).
If one hydrogen atom is replaced by chlorine, it forms ChloroPropane.
The molecular formula of ChloroPropane is C3H7Cl.
Q. Homologus series is a family of organic compounds having same functional group. Give the formulae of first three homologues of carboxylic acids.
Ans: The first three carboxylic acids are;
1. Methanoic acid (HCOOH),
2. Ethanoic acid (CH3COOH),
3. Propanoic acid (C2H5COOH)
Q. Name the part of soap molecule that is hydrophilic.
Ans: The ionic oart of soap molecule i.e C=O_O-Na is hydrophilloc in nature.
Q. Ethane, with the molecular formula C2H6 has;
a.) 6 covalent bonds b.) 7 covalent bonds
c.) 8 covalent bonds d.) 9 covalent bonds
Ans:-- 7 covalent bonds.
Q. Butanone is a four- carbon compound with the functional group;
a.) carboxylic acid b.) aldehyde
c.) ketone d.) alcohol
Ans:-- ketone.
Q. While cooking, if the bottom of vessel is getting black on the outside, it means that:
a. The food is not cooker properly
b. The fuel is not burned properly
c. The fuel is wet
d. The fuel is burning completely
Ans: b. The fuel is not burned properly
Q. which of the following types of medicines are used for treating in digestions?
a.) Antibiotic b.) Analgesic
c.) Antacid d.) Antiseptic
Ans:--- Antacid.
Q. Carboxylic acid group is present in one of the following;
a.) Propanone b.) Acetaldehyde
c.) Ethanoic acid d.) Hydrochloric acid
Ans:-- Ethanoic acid.
Q. Vinegar is;
a.) 25% acetic acid b.) 6- 8% acetic acid
c.) pure acetic acid d.) 50% acetic acid
Ans:-- 6- 8% acetic acid
Q. Aldehyde group is present in one of the following;
a.) Propanone b.) Acetaldehyde
c.) Ethanoic acid d.) Hydrochloric acid
Ans:-- Acetaldehyde.
8. Ethane with molecular formula C2H6 has:
a) 6 Covalent bonds b) 8 Covalent bonds c) 7 Covalent bonds d) 9 Covalent bonds
Ans: c) 7 Covalent bonds
Q. Which among the following represents the functional group of aldehydes
a. -COOH b. CHO c. -C=O d. C=C
Ans: c. -C=O
Q. Butanone is a four carbon compound with the functional group:
a. -COOH b. -CHO c. -C=O d. -C-Br
Ans: b. -CHO
Q. Which of the following has 10 covalent bonds
a. Ethane b. Propane c. Butane d. Pentane
Ans: b. Propane
Q. Draw electron dot structure of Ammonia molecule?
Ans:
Q. Write structural formula of cyclohexane?
Ans:
Assertion: When a Copper object remains exposed to air for the long time, It looses its lusture,
Reason: Cooper reacts with atmospheric gases to form green coating of copper carbonate on its surface.
Ans: Both Assertion and reason are true and R is correct explaination of A.
Q. Which among the following exist in native state in nature;
I. Cu (Copper), II. Au (Gold),
III. Zn (Zinc), IV. Ag (Silver)
Ans:
A. I and II B. II and IV C. II and III
D. III ans IV
Ans: B. II and IV (Gold and Silver)
Q. Which among the following is the least reactive metal:
a. Sodium b. Zinc c. Mercury d. Aluminium
Ans: c. Mercury
Q. Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?
a. Good thermal conductivity b. Good electrical conductivity
c. Ductility d. High melting point
Ans: Good thermal conductivity and High Melting point
Q. Which one of the following properties is not generally exhibited by ionic compounds?
a. Solubility in water b. Electric conductivity in Solid state
c. High M.P and B.P d. Electric conductivity in Molten state
Ans: b. Electric conductivity in Solid state
Q. Which of the following oxides of iron would be obtained on prolonged reaction with steam?
a. FeO b. Fe2O3 and Fe3O4 c. Fe3O4 d. Fe2O3
Ans: c. Fe3O4
Q. Zinc reacts with H2SO4 to give;
a.) N2 b.) O2 c.) H2 d.) Cl2
Ans:-- H2
Q. pH of pure water is;
a.) 7 b.) 6 c.) 8 d.) 9
Ans:-- 7
Q. The acid present in stomach is;
a.) HCl b.) H2SO4 c.) HNO3 4.) CH3COOH
Ans:-- HCl
Q. Which of the following types of medicines is used for treating indigestion?
a.) Antibiotic b.) Analgesic
c.) Antacid d.) Antiseptic
Ans:-- Antacid.
Q. pH of base solution is;
a.) 7 b.) >7 c.) <7 d.) 1
Ans:-- >7
Q. The formula of lime stone is;
a.) CaO b.) Ca(OH)2 c.) CaCO3 d.) CaSO4
Ans:-- CaCO3
Q. Na2O reacts with water to give;
a.) NaCl b.) NaOH
c.) Na2CO3 d.) NaHCO3
Ans:-- NaOH
Q. The formula of Plaster of Paris is;
a.) CaSO4 b.) CaSO4. 2H2O
c.) CaSO4. 3H2O
d.) CaSO4.H2O
Ans:-- CaSO4.2H2O
Q. which of the following phenomenon occur when a small amount of acid is added to water?
a.) Ionisation b.) Dilution
c.) Neutralisation d.) Salt formation
Ans:-- Ionisation.
Q. Our body works within the pH range of;
a.) 7.0 - 7.8 b.) 7.6 - 7.9
c.) 7.2 - 7.5 d.) 7.0 - 7.5
Ans:-- 7.2 - 7.5
Q. What is the pH of blood?
Q. Name the substance which on treatment with chlorine yields bleaching powder.
Ans: When Calcium hydroxide is treated with chlorine, it forms bleaching powder.
Q. Reaction between an acid and a base to form a salt is called
A. Saponification
B. Neutralization
C. Sublimation
D. None of these
Ans: B. Neutralization
Q. The salt derived from strong acid and strong base forms a solution having a pH value,
A. More than 7
B. Less than 7
C. Equal to 7
D. Between 7 and 14
Ans: C. Equal to 7
Q. Which among the following is an example of salt?
A. Sulphuric acid
B. Pottasium hydroxide
C. Hydrogen chloride
D. Pottasium nitrate
Ans: D. Pottasium nitrate
Q. Which salt among following is used in fire extinguishers?
A. Sodium carbonate
B. Sodium bicarbonate
C. Calcium carbonate
D. None of these
Ans: B. Sodium bicarbonate
Q. The solution of salt is having pH value less than 7, the salt has been derived from
A. A weak acid and a weak base
B. A strong acid and a strong base
C. A weak acid and a strong base
D. A strong acid and a weak base
Ans: D. A strong acid and a weak base
Q. Another name of baking soda:
Ans: Sodium Bicarbonate.
Q. Another name of Caustic soda;
Ans: Sodium hydroxide.
Q. Another name of Washing soda
Ans: Sodium carbonate.
Q. Formula of Plaster of Paris;
Ans: CaSO4.2H2O
Q. Name the sodium compound which is used for softening hard water.
Ans: Sodium Carbonate also called Washing Soda is used for softening hard water.
Its formula is Na2CO3.
Q. Human body works within the PH range of:
A. 1.0 to 7.0 B. 7.0 to 14 C. 7.0 to 7.8 D. 7.8 to 9.8
Ans: C. 7.0 to 7.8
Hint: This question is factually incorrect. It probably is talking about blood with works in the range of 6.8 to 7.8. Some body parts have low pH such as Skin which has pH as low as 5.0
Q. There is a solution that turns red litmus blue. The pH of that solution is likely to be
A. 1 B. 5 C. 4 D. 10
Ans: 10
Q. An aqueous solution turns red litmus solution blue. Excess addition of which of the following solutions would reverse the change?
A. Baking Soda B. Lime C. Ammonium hydroxide D. Hydrochloric acid
Ans: D. Hydrochloric acid
Q. Which of the following gives the correct increasing order of acid strength?
Water (H2O) , Acetic Acid (CH3COOH), Hydrochloric Acid (HCl)
Ans: Hydrochloric acid is more acidic than Acetic acid which is more acidic than water.
Q. The pH value of a solution is lower, when:
A. The hydronium ion concentration is higher
B. the Hydronium ion concentration is lower
C. the hydroxide ion concentration is higher
D. the hydronium ion concentration is equal to hydroxide ion concentration
Ans: A. The hydronium ion concentration is higher
Q. Which of the following statements are correct about an aqueous solution of an acid and of a base?
a. Higher the pH, Stronger the acid b. Higher the pH, weaker the acid
c. Lower the pH, stronger the base d. Lower the pH, Weaker the base
e. Both B and C
Ans: Both B and C
Q. Three solutions A, B and C when tested with universal indicator showed pH as 5, 1 and 13 respectively. Based on the observation, Choose the correct statement from the following:
a. A is strong acid and B is weak acid b. A is weak acid, C is weak base
c. Both A and B are strong acids d. B is strong acid, C is strong base
Ans: d. B is strong acid, C is strong base
Q. Which of the following phenomena occur, when a small amount of acid is added to water,
i. Ionisation ii. Neutralization iii. Dilution iv. Both A and C
Ans: iv. Both A and C (Both Ionization and Dilution)
Ans:
Unit: Metals and Non- Metals
Q. What is corrosion? Name any two metals which do not corrode easily.
Ans: Corrosion is the reaction of metal with the air and moisture.
The two metals which doesn’t corrode easily are Gold and Silver.
Q. What are Metals? State two physical properties of Metals.
Ans: A metal is a material that has lustrous appearance, and conducts electricity and heat relatively well. Metals are typically ductile and malleable. These properties are the result of the metallic bond between the atoms or molecules of the metals.
Q. Metals obtained by electrolytic reduction are:
A. Low in activity series
B. In middle of activity series
C. Towards top of activity series
D. Both A and B
Ans: C. Towards top of activity series
A. Low in activity series
B. In middle of activity series
C. Towards top of activity series
D. Both A and B
Ans: C. Towards top of activity series
Q. Assertion and reason:
Assertion: When a Copper object remains exposed to air for the long time, It looses its lusture,
Reason: Cooper reacts with atmospheric gases to form green coating of copper carbonate on its surface.
Ans: Both Assertion and reason are true and R is correct explaination of A.
Q. Which among the following exist in native state in nature;
I. Cu (Copper), II. Au (Gold),
III. Zn (Zinc), IV. Ag (Silver)
Ans:
A. I and II B. II and IV C. II and III
D. III ans IV
Ans: B. II and IV (Gold and Silver)
Q. During electrolytic refining of zinc, it gets
A. Deposited at cathode
B. Deposited at anode
C. Deposited at both cathode and anode
D. Remains in the solution
Ans: A. Deposited at cathode
Q. Metals obtained by electrolytic reduction are
A. Low in activity series
B. In middle of activity series
C. Towards the top of activity series
D. Both A and B
Ans: C. Towards the top of activity series
Q. Amalgam is an alloy of;
a.) copper and zinc
b.) Metal and mercury
c.) sodium and potassium
d.) iron and carbon
Ans:-- metal and mercury.
Q. The metal which is liquid at room temperature is;
a.) Mercury b.) silver
c.) copper d.) Aluminium
Ans:--Mercury.
Q. Aqua regia is a mixture of;
a.) conc. HCl and conc. HNO3 (3:1)
b.) conc. H2SO4 and conc. HNO3 ( 3:1)
c.) conc. HNO3 and conc. HCl (3:1)
d.) none of these
Ans:-- Conc. HCl and conc. HNO3 (3:1)
Q. Metal which has no action withwater is;
A. Deposited at cathode
B. Deposited at anode
C. Deposited at both cathode and anode
D. Remains in the solution
Ans: A. Deposited at cathode
Q. Metals obtained by electrolytic reduction are
A. Low in activity series
B. In middle of activity series
C. Towards the top of activity series
D. Both A and B
Ans: C. Towards the top of activity series
Q. Amalgam is an alloy of;
a.) copper and zinc
b.) Metal and mercury
c.) sodium and potassium
d.) iron and carbon
Ans:-- metal and mercury.
Q. The metal which is liquid at room temperature is;
a.) Mercury b.) silver
c.) copper d.) Aluminium
Ans:--Mercury.
Q. Aqua regia is a mixture of;
a.) conc. HCl and conc. HNO3 (3:1)
b.) conc. H2SO4 and conc. HNO3 ( 3:1)
c.) conc. HNO3 and conc. HCl (3:1)
d.) none of these
Ans:-- Conc. HCl and conc. HNO3 (3:1)
Q. Metal which has no action withwater is;
a.)sodium b.) calcium
c.) Magnesium d.) Gold
Ans:-- gold
Q. The flux used in blast furnace to remove the unwanted impurities is;
a.) basic b.) acidic c.) neutral d.) amphoteric
Ans:-- basic
Q. The non metal which is a good conductor of electricity;
a.) sulphur b.) Graphite
c.) Phosphorus d.) iodine
Ans:-- Graphite
Q. which non metal is liquid at room temperature?
a.) carbon b.) sulphur c.) bromine d.) oxygen
Ans:-- bromine
Q. which is the most malleable metal?
a.) Gold b.) lead c.) iron d.) copper
Ans:-- Gold
Q. The metal which will displace zinc from znso4 solution is;
a.) copper b.) silver c.) Magnesium d.) iron
Ans:-- Magnesium
Q. Metals of low reactivity are extracted by;
a.) heating alone b.) electrolysis
c.) reduction d.) none
Ans:-- Heating alone
Q. Most of highly reactive metals are extracted by:
A. Heating alone B. Reduction
C. Electrolysis D. None
Ans: C. Electrolysis.
Q. Which of following is an Iron Ore?
A. Cinnabar B. Calamite
C. Haematite D. Rock Salt
Ans: C. Haematite.
Q. The process of extraction of metal from its ore is called?
A. Smelting B. Refining
C. Metallurgy D. Calcination
Ans: C. Metallurgy
Q. which of the following is emphoteric oxide?
a.) co2 b.) ZnO c.) Na2O d.) K2O
Ans:-- ZnO
Q. which of the following methods is suitable for preventing an iron pan from rusting;
a.) applying grease b.) applying paint
c.) applying coating of zinc d.) all of the above
Ans:-- Applying a coating of zinc
Q.Food cans are coated with tin and not zinc because;
a.)zinc is costlier than tin
b.) zinc has higher melting point than tin
c.) zinc is more reactive than tin
d.) zinc is less reactive than tin.
Ans:-- C, Zinc is more reactive than Tin
Q. Which of following pairs will give displacement reactions?
a. NaCl solution and Copper metal
b. MgCl2 solution and Aluminium metal
c. FeSO4 solution and silver metal
d. AgNO3 solution and copper metal
Ans: d. AgNO3 solution and copper metal.
Q. Which one of these following four metals would be displaced from the solution of its salts by other three metals?
A. Magnesium B. Silver C. Zinc D. Copper
Ans: Silver
Q. Why Platinum, Gold and Silver are used to make Jewellery?
Ans: They do not react with air and do not corrode easily. Upon that they are lustrous as well.
Q. Why Sodium, Potassium and Lithium are stored under the oil
Ans: Sodium, potassium, and lithium are very reactive metals and react vigorously with air as well as water. Therefore, they are kept immersed in kerosene oil in order to prevent their contact with air and moisture.
Q. Arrange the following elements in the order of their decreasing metallic character:
Sodium Na, Silicon Si, Chlorine Cl, Magnesium Mg, Aluminium Al.
Ans: Since Metallic character decreases from Left to Right, Therefore,
Sodium Na > Magnesium Mg > Aluminum Al > Silicon Si > Chlorine Cl.
c.) Magnesium d.) Gold
Ans:-- gold
Q. The flux used in blast furnace to remove the unwanted impurities is;
a.) basic b.) acidic c.) neutral d.) amphoteric
Ans:-- basic
Q. The non metal which is a good conductor of electricity;
a.) sulphur b.) Graphite
c.) Phosphorus d.) iodine
Ans:-- Graphite
Q. which non metal is liquid at room temperature?
a.) carbon b.) sulphur c.) bromine d.) oxygen
Ans:-- bromine
Q. which is the most malleable metal?
a.) Gold b.) lead c.) iron d.) copper
Ans:-- Gold
Q. The metal which will displace zinc from znso4 solution is;
a.) copper b.) silver c.) Magnesium d.) iron
Ans:-- Magnesium
Q. Metals of low reactivity are extracted by;
a.) heating alone b.) electrolysis
c.) reduction d.) none
Ans:-- Heating alone
Q. Most of highly reactive metals are extracted by:
A. Heating alone B. Reduction
C. Electrolysis D. None
Ans: C. Electrolysis.
Q. Which of following is an Iron Ore?
A. Cinnabar B. Calamite
C. Haematite D. Rock Salt
Ans: C. Haematite.
Q. The process of extraction of metal from its ore is called?
A. Smelting B. Refining
C. Metallurgy D. Calcination
Ans: C. Metallurgy
Q. which of the following is emphoteric oxide?
a.) co2 b.) ZnO c.) Na2O d.) K2O
Ans:-- ZnO
Q. which of the following methods is suitable for preventing an iron pan from rusting;
a.) applying grease b.) applying paint
c.) applying coating of zinc d.) all of the above
Ans:-- Applying a coating of zinc
Q.Food cans are coated with tin and not zinc because;
a.)zinc is costlier than tin
b.) zinc has higher melting point than tin
c.) zinc is more reactive than tin
d.) zinc is less reactive than tin.
Ans:-- C, Zinc is more reactive than Tin
Q. Which of following pairs will give displacement reactions?
a. NaCl solution and Copper metal
b. MgCl2 solution and Aluminium metal
c. FeSO4 solution and silver metal
d. AgNO3 solution and copper metal
Ans: d. AgNO3 solution and copper metal.
Q. Which one of these following four metals would be displaced from the solution of its salts by other three metals?
A. Magnesium B. Silver C. Zinc D. Copper
Ans: Silver
Q. Why Platinum, Gold and Silver are used to make Jewellery?
Ans: They do not react with air and do not corrode easily. Upon that they are lustrous as well.
Q. Why Sodium, Potassium and Lithium are stored under the oil
Ans: Sodium, potassium, and lithium are very reactive metals and react vigorously with air as well as water. Therefore, they are kept immersed in kerosene oil in order to prevent their contact with air and moisture.
Q. Arrange the following elements in the order of their decreasing metallic character:
Sodium Na, Silicon Si, Chlorine Cl, Magnesium Mg, Aluminium Al.
Ans: Since Metallic character decreases from Left to Right, Therefore,
Sodium Na > Magnesium Mg > Aluminum Al > Silicon Si > Chlorine Cl.
17. Assertion(A): Metalloids are classified as semi-metals
Reason (R): Metalloids are intermediate in properties then exhibit properties of both metals and non- metals.
Ans: A and R are true and R is correct explanation of A
Q. Arrange the following elements in the order of their decreasing metallic character:
Sodium Na, Silicon Si, Chlorine Cl, Magnesium Mg, Aluminium Al.
Ans: Since Metallic character decreases from Left to Right, Therefore,
Sodium Na > Magnesium Mg > Aluminium Al > Silicon Si > Chlorine Cl.
Q. Which among the following is the least reactive metal:
a. Sodium b. Zinc c. Mercury d. Aluminium
Ans: c. Mercury
Q. Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?
a. Good thermal conductivity b. Good electrical conductivity
c. Ductility d. High melting point
Ans: Good thermal conductivity and High Melting point
Q. Which one of the following properties is not generally exhibited by ionic compounds?
a. Solubility in water b. Electric conductivity in Solid state
c. High M.P and B.P d. Electric conductivity in Molten state
Ans: b. Electric conductivity in Solid state
Q. Which of the following oxides of iron would be obtained on prolonged reaction with steam?
a. FeO b. Fe2O3 and Fe3O4 c. Fe3O4 d. Fe2O3
Ans: c. Fe3O4
Unit: Acids, Bases And Salts
Q. The indicators which turn red in acid solution are:
a. Turmeric and litmus b. Phenolphthalein and Litmus
c. Litmus and Methyl orange d. Phenolphthalein and methyl orange
Ans: c. Litmus and Methyl orange
Q. The Property which is common between Vinegar and Curd is:
a. Sweet taste b. Tasteless c. Bitter taste d. Sour taste
Ans: d. Sour taste
Q. The indicator which produces a pink colour in an alkaline solution is:
a. Methyl orange b. Turmeric powder c. Phenolphthalein d. Litmus paper
Ans: c. Phenolphthalein
Q. One of the following is not an organic acid. This is
a. Ethanoic acid b. Formic acid c. Citic acid d. Carbonic acid
Ans: d. Carbonic acid
Q. The property which is not shown by acid is:
a. They have sour taste b. They feel soapy
c. They turn litmus red d. Their pH is < 7
Ans: b. They feel soapy
Q. The number of molecules of water of crystallization present in washing soda crystal is:
a. Five b. Two c. Ten d. Seven
Ans: c. Ten
Q. What are amphoteric oxides? Give two examples
Ans: Amphoteric oxides are the oxides which have a tendency to react with both acid and base to form salt and water are known as amphoteric oxides. Examples: Al2O3, ZnO
Q. Bee stings can be treated with?
A. Vinegar B. Potassium hydroxide C. Sodium hydrogen carbonate D. Lemon Juice
Ans: C. Sodium hydrogen carbonate
Q. The acid produced naturally in our stomach is:
a. Acetic acid b. Citric acid c. Hydrochloric acid d. Sulphuric acid
Ans: c. Hydrochloric acid
Q. Zinc reacts with H2SO4 to give;
a.) N2 b.) O2 c.) H2 d.) Cl2
Ans:-- H2
Q. pH of pure water is;
a.) 7 b.) 6 c.) 8 d.) 9
Ans:-- 7
Q. The acid present in stomach is;
a.) HCl b.) H2SO4 c.) HNO3 4.) CH3COOH
Ans:-- HCl
Q. Which of the following types of medicines is used for treating indigestion?
a.) Antibiotic b.) Analgesic
c.) Antacid d.) Antiseptic
Ans:-- Antacid.
Q. pH of base solution is;
a.) 7 b.) >7 c.) <7 d.) 1
Ans:-- >7
Q. The formula of lime stone is;
a.) CaO b.) Ca(OH)2 c.) CaCO3 d.) CaSO4
Ans:-- CaCO3
Q. Na2O reacts with water to give;
a.) NaCl b.) NaOH
c.) Na2CO3 d.) NaHCO3
Ans:-- NaOH
Q. The formula of Plaster of Paris is;
a.) CaSO4 b.) CaSO4. 2H2O
c.) CaSO4. 3H2O
d.) CaSO4.H2O
Ans:-- CaSO4.2H2O
Q. which of the following phenomenon occur when a small amount of acid is added to water?
a.) Ionisation b.) Dilution
c.) Neutralisation d.) Salt formation
Ans:-- Ionisation.
Q. Our body works within the pH range of;
a.) 7.0 - 7.8 b.) 7.6 - 7.9
c.) 7.2 - 7.5 d.) 7.0 - 7.5
Ans:-- 7.2 - 7.5
Q. What is the pH of blood?
a.) 7 b.) 1 c.) 7.3 d.) 0.0
Ans:-- 7.3
Q. Sting of Nettle plant contains;
a.) Methanoic acid b.) Citric acid
c.) Oxalic acid d.) Tartaric acid
Ans:-- Methanoic acid
Q. Which of the following is acidic in nature?
a.) Lime juice b.) Lime water
c.) Antacid d.) Human blood
Ans:-- Lime juice.
Q. A solution turns red litmus solution blue. Its pH is likely to be;
a.) 1 b.) 4 c.) 5 d.) 10
Ans:-- 10
Q.. Calcium phosphate is present in tooth enamel, its nature is;
a.) basic b.) acidic
c.) neutral d.) amphoteric
Ans:-- basic.
Q. A solution reacts with crushed egg shells to give a gas that turns lime water milky. The solution contains;
a.) NaCl b.) HCl c.) LiCl d.) KCl
Ans:-- HCl
Ans:-- 7.3
Q. Sting of Nettle plant contains;
a.) Methanoic acid b.) Citric acid
c.) Oxalic acid d.) Tartaric acid
Ans:-- Methanoic acid
Q. Which of the following is acidic in nature?
a.) Lime juice b.) Lime water
c.) Antacid d.) Human blood
Ans:-- Lime juice.
Q. A solution turns red litmus solution blue. Its pH is likely to be;
a.) 1 b.) 4 c.) 5 d.) 10
Ans:-- 10
Q.. Calcium phosphate is present in tooth enamel, its nature is;
a.) basic b.) acidic
c.) neutral d.) amphoteric
Ans:-- basic.
Q. A solution reacts with crushed egg shells to give a gas that turns lime water milky. The solution contains;
a.) NaCl b.) HCl c.) LiCl d.) KCl
Ans:-- HCl
Q. What is universal indicator?
Ans: Universal indicator is a mixture of many indicators that gives different colours at different pH values.
Ans: Universal indicator is a mixture of many indicators that gives different colours at different pH values.
Q. A substance having a pH value of 12 is a
A. Strong acid B. Strong base
C. Weak acid D. Weak base
Ans: B. Strong base
Q. pH value of weak acids ranges from
A. 0 -3 B. 7 -10 C. 5-7 D. 12 -14
Ans: C. 5-7
Q. Which among the following is a weak acid?
A: HCl B. Acetic acid
C. H2SO4 D. HNO3
Ans B. Acetic acid
Q. The reaction between H+ ions given by the acid with OH- ions given by the base to form water, is called
A. Crystillization B. Condensation
C. Neutralization D. Both B and C
Ans: C. Neutralization
Q. Strong bases when dissolved in water
A. Dissociate completly into ions
B. Give large amounts of OH- ions in solution
C. Dissociate incompletely and give less ions
D. Both A and B
Ans: D. Both A and B
A. Strong acid B. Strong base
C. Weak acid D. Weak base
Ans: B. Strong base
Q. pH value of weak acids ranges from
A. 0 -3 B. 7 -10 C. 5-7 D. 12 -14
Ans: C. 5-7
Q. Which among the following is a weak acid?
A: HCl B. Acetic acid
C. H2SO4 D. HNO3
Ans B. Acetic acid
Q. The reaction between H+ ions given by the acid with OH- ions given by the base to form water, is called
A. Crystillization B. Condensation
C. Neutralization D. Both B and C
Ans: C. Neutralization
Q. Strong bases when dissolved in water
A. Dissociate completly into ions
B. Give large amounts of OH- ions in solution
C. Dissociate incompletely and give less ions
D. Both A and B
Ans: D. Both A and B
Q. Name the substance which on treatment with chlorine yields bleaching powder.
Ans: When Calcium hydroxide is treated with chlorine, it forms bleaching powder.
Q. Reaction between an acid and a base to form a salt is called
A. Saponification
B. Neutralization
C. Sublimation
D. None of these
Ans: B. Neutralization
Q. The salt derived from strong acid and strong base forms a solution having a pH value,
A. More than 7
B. Less than 7
C. Equal to 7
D. Between 7 and 14
Ans: C. Equal to 7
Q. Which among the following is an example of salt?
A. Sulphuric acid
B. Pottasium hydroxide
C. Hydrogen chloride
D. Pottasium nitrate
Ans: D. Pottasium nitrate
Q. Which salt among following is used in fire extinguishers?
A. Sodium carbonate
B. Sodium bicarbonate
C. Calcium carbonate
D. None of these
Ans: B. Sodium bicarbonate
Q. The solution of salt is having pH value less than 7, the salt has been derived from
A. A weak acid and a weak base
B. A strong acid and a strong base
C. A weak acid and a strong base
D. A strong acid and a weak base
Ans: D. A strong acid and a weak base
Q. Another name of baking soda:
Ans: Sodium Bicarbonate.
Q. Another name of Caustic soda;
Ans: Sodium hydroxide.
Q. Another name of Washing soda
Ans: Sodium carbonate.
Q. Formula of Plaster of Paris;
Ans: CaSO4.2H2O
Ans: Sodium Carbonate also called Washing Soda is used for softening hard water.
Its formula is Na2CO3.
Q. Human body works within the PH range of:
A. 1.0 to 7.0 B. 7.0 to 14 C. 7.0 to 7.8 D. 7.8 to 9.8
Ans: C. 7.0 to 7.8
Hint: This question is factually incorrect. It probably is talking about blood with works in the range of 6.8 to 7.8. Some body parts have low pH such as Skin which has pH as low as 5.0
Q. There is a solution that turns red litmus blue. The pH of that solution is likely to be
A. 1 B. 5 C. 4 D. 10
Ans: 10
Q. An aqueous solution turns red litmus solution blue. Excess addition of which of the following solutions would reverse the change?
A. Baking Soda B. Lime C. Ammonium hydroxide D. Hydrochloric acid
Ans: D. Hydrochloric acid
Q. Which of the following gives the correct increasing order of acid strength?
Water (H2O) , Acetic Acid (CH3COOH), Hydrochloric Acid (HCl)
Ans: Hydrochloric acid is more acidic than Acetic acid which is more acidic than water.
Q. The pH value of a solution is lower, when:
A. The hydronium ion concentration is higher
B. the Hydronium ion concentration is lower
C. the hydroxide ion concentration is higher
D. the hydronium ion concentration is equal to hydroxide ion concentration
Ans: A. The hydronium ion concentration is higher
Q. Which of the following statements are correct about an aqueous solution of an acid and of a base?
a. Higher the pH, Stronger the acid b. Higher the pH, weaker the acid
c. Lower the pH, stronger the base d. Lower the pH, Weaker the base
e. Both B and C
Ans: Both B and C
Q. Three solutions A, B and C when tested with universal indicator showed pH as 5, 1 and 13 respectively. Based on the observation, Choose the correct statement from the following:
a. A is strong acid and B is weak acid b. A is weak acid, C is weak base
c. Both A and B are strong acids d. B is strong acid, C is strong base
Ans: d. B is strong acid, C is strong base
Q. Which of the following phenomena occur, when a small amount of acid is added to water,
i. Ionisation ii. Neutralization iii. Dilution iv. Both A and C
Ans: iv. Both A and C (Both Ionization and Dilution)
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