VARDAAN LEARNING INSTITUTE

1. Which of the following is NOT a physical change?
   (a) Boiling of water to give water vapour

   (b) Melting of ice to give water

   (c) Dissolution of salt in water

   (d) Combustion of Liquefied Petroleum Gas (LPG)
2. Magnesium ribbon is rubbed before burning because it has a coating of:
   (a) Basic magnesium carbonate

   (b) Basic magnesium oxide

   (c) Basic magnesium sulphide

   (d) Basic magnesium chloride
3. In a chemical reaction between sulphuric acid and barium chloride solution, the white precipitate formed is of:
   (a) Hydrochloric acid

   (b) Barium sulphate

   (c) Chlorine

   (d) Sulphur
4. Which of the following equations is balanced?
   (a) $Fe + H_2O \rightarrow Fe_3O_4 + H_2$

   (b) $3Fe + 4H_2O \rightarrow Fe_3O_4 + 4H_2$

   (c) $3Fe + 4H_2O \rightarrow Fe_3O_4 + H_2$

   (d) $3Fe + H_2O \rightarrow Fe_3O_4 + 4H_2$
5. The reaction of Calcium Oxide with water is an example of:
   (a) Decomposition Reaction

   (b) Combination Reaction

   (c) Displacement Reaction

   (d) Double Displacement Reaction
6. When lead nitrate powder is heated in a boiling tube, we observe:
   (a) Brown fumes of nitrogen dioxide

   (b) Brown fumes of lead oxide

   (c) Yellow fumes of nitrogen dioxide

   (d) Brown fumes of nitric oxide
7. Which of the following is an endothermic process?
   (a) Dilution of sulphuric acid

   (b) Sublimation of dry ice

   (c) Condensation of water vapour

   (d) Respiration in human beings
8. Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is:
   (a) 1:1

   (b) 2:1

   (c) 4:1

   (d) 1:2
9. Which of the following gases can be used for storage of fresh sample of an oil for a long time?
   (a) Carbon dioxide or oxygen

   (b) Nitrogen or oxygen

   (c) Carbon dioxide or helium

   (d) Helium or nitrogen
10. Fatty foods become rancid due to the process of:
    (a) Oxidation

    (b) Corrosion

    (c) Reduction

    (d) Hydrogenation
11. The chemical formula of rust is:
    (a) $Fe_2O_3$

    (b) $Fe_3O_4$

    (c) $Fe_2O_3 \cdot xH_2O$

    (d) $Fe_3O_4 \cdot xH_2O$
12. Which information is NOT conveyed by a balanced chemical equation?
    (a) Physical states of reactants and products

    (b) Symbols and formulae of all substances involved

    (c) Number of atoms/molecules of reactants and products

    (d) Whether a particular reaction is actually feasible or not
13. $MnO_2 + 4HCl \rightarrow MnCl_2 + 2H_2O + Cl_2$. In this reaction, the substance oxidized is:
    (a) $MnO_2$

    (b) $HCl$

    (c) $MnCl_2$

    (d) $Cl_2$
14. To prevent chips from oxidizing, the bags are flushed with:
    (a) Oxygen

    (b) Nitrogen

    (c) Hydrogen

    (d) Chlorine
15. A solution of substance 'X' is used for whitewashing. 'X' is:
    (a) Calcium Oxide

    (b) Calcium Hydroxide

    (c) Calcium Carbonate

    (d) Calcium Bicarbonate
16. The colour of Ferrous Sulphate crystals ($FeSO_4 \cdot 7H_2O$) is:
    (a) Blue

    (b) Pale Green

    (c) White

    (d) Brown
17. $Fe_2O_3 + 2Al \rightarrow Al_2O_3 + 2Fe$. This reaction is an example of:
    (a) Combination reaction

    (b) Double displacement reaction

    (c) Decomposition reaction

    (d) Displacement reaction
18. Respiration is a/an:
    (a) Exothermic reaction

    (b) Endothermic reaction

    (c) Reduction reaction

    (d) Combination reaction
19. When AgCl is exposed to sunlight, it turns:
    (a) White

    (b) Grey

    (c) Black

    (d) Yellow
20. The removal of oxygen from a substance is called:
    (a) Oxidation

    (b) Corrosion

    (c) Reduction

    (d) Rancidity
21. Burning of Natural Gas (Methane) is:
    (a) Exothermic

    (b) Endothermic

    (c) Both

    (d) None
22. What happens when dilute hydrochloric acid is added to iron fillings?
    (a) Hydrogen gas and iron chloride are produced.

    (b) Chlorine gas and iron hydroxide are produced.

    (c) No reaction takes place.

    (d) Iron salt and water are produced.
23. In the reaction $CuO + H_2 \rightarrow Cu + H_2O$, copper oxide is:
    (a) Oxidized

    (b) Reduced

    (c) A reducing agent

    (d) None of these
24. Precipitate is a/an:
    (a) Soluble solid

    (b) Insoluble solid

    (c) Liquid product

    (d) Gas
25. Lead Nitrate formula is:
    (a) $PbNO_3$

    (b) $Pb(NO_3)_2$

    (c) $Pb_2(NO_3)$

    (d) $Pb(NO_2)_2$
26. Which of the following is a balanced equation for the reaction of Zinc with Sulphuric Acid?
    (a) $Zn + H_2SO_4 \rightarrow ZnSO_4 + H_2$

    (b) $Zn + 2H_2SO_4 \rightarrow ZnSO_4 + H_2O$

    (c) $Zn + H_2SO_4 \rightarrow ZnS + H_2 + 2O_2$

    (d) $2Zn + H_2SO_4 \rightarrow 2ZnSO_4 + H_2$
27. Slaked lime is:
    (a) $CaO$

    (b) $CaCO_3$

    (c) $Ca(OH)_2$

    (d) $CaCl_2$
28. Marble's chemical formula is:
    (a) $CaO$

    (b) $Ca(OH)_2$

    (c) $CaCO_3$

    (d) $CaSO_4$
29. Which reaction is used in black and white photography?
    (a) Thermal Decomposition

    (b) Electrolytic Decomposition

    (c) Photolytic Decomposition

    (d) Displacement Reaction
30. When copper powder is heated, it turns:
    (a) Blue

    (b) Black

    (c) Red

    (d) Yellow
31. Silver bromide ($AgBr$) is kept in dark bottles because:
    (a) It evaporates

    (b) It reacts with air

    (c) It reacts with glass

    (d) It decomposes in light
32. Elements like Gold and Platinum do not corrode easily because:
    (a) They are highly reactive

    (b) They are noble metals (least reactive)

    (c) They are hard

    (d) They are brittle
33. Chemically, rust is:
    (a) Hydrated ferric oxide

    (b) Hydrated ferrous oxide

    (c) Ferric chloride

    (d) None of the above
34. Which of the following is a Double Displacement reaction?
    (a) $Pb + CuCl_2 \rightarrow PbCl_2 + Cu$

    (b) $Na_2SO_4 + BaCl_2 \rightarrow BaSO_4 + 2NaCl$

    (c) $C + O_2 \rightarrow CO_2$

    (d) $CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O$
35. Nitrogen dioxide ($NO_2$) fumes are of which colour?
    (a) Green

    (b) Brown

    (c) Yellow

    (d) Colourless
36. Identify the reduction reaction:
    (a) Gain of oxygen

    (b) Loss of hydrogen

    (c) Gain of hydrogen

    (d) Loss of electrons
37. $2KClO_3 \xrightarrow{\text{Heat}} 2KCl + 3O_2$ is a:
    (a) Decomposition reaction

    (b) Combination reaction

    (c) Displacement reaction

    (d) Redox reaction only
38. Burning of Magnesium ribbon is a:
    (a) Physical change

    (b) Chemical change

    (c) Both

    (d) None
39. The breakdown of glucose in cells to produce energy is called:
    (a) Digestion

    (b) Respiration

    (c) Excretion

    (d) Photosynthesis
40. Zinc can displace copper from copper sulphate solution because zinc is:
    (a) Less reactive than copper

    (b) More reactive than copper

    (c) Equally reactive

    (d) A noble metal
41. Which gas is produced when dilute HCl is added to a reactive metal?
    (a) Oxygen

    (b) Nitrogen

    (c) Carbon Dioxide

    (d) Hydrogen
42. Reaction of acid and base to form salt and water is called:
    (a) Decomposition

    (b) Neutralization

    (c) Combination

    (d) Reduction
43. When electricity is passed through water, the volume ratio of $O_2$ to $H_2$ collected is:
    (a) 1 : 2

    (b) 2 : 1

    (c) 1 : 8

    (d) 8 : 1
44. A redox reaction is one where:
    (a) Only oxidation takes place

    (b) Only reduction takes place

    (c) Both oxidation and reduction take place simultaneously

    (d) None of these
45. Which of the following is a balanced chemical equation?
    (a) $Mg + O_2 \rightarrow MgO$

    (b) $Mg + O_2 \rightarrow 2MgO$

    (c) $2Mg + O_2 \rightarrow 2MgO$

    (d) $2Mg + O \rightarrow 2MgO$
46. The formula for Quick Lime is:
    (a) $Ca(OH)_2$

    (b) $CaCO_3$

    (c) $CaO$

    (d) $CaCl_2$
47. What type of reaction is $CaO + H_2O \rightarrow Ca(OH)_2$?
    (a) Displacement

    (b) Combination

    (c) Decomposition

    (d) Double Displacement
48. Galvanisation is a method to protect iron from rusting by coating it with a thin layer of:
    (a) Gallium

    (b) Aluminium

    (c) Zinc

    (d) Silver
49. $Na_2SO_4(aq) + BaCl_2(aq) \rightarrow BaSO_4(s) + 2NaCl(aq)$. The insoluble product is:
    (a) Sodium chloride

    (b) Barium sulphate

    (c) Barium chloride

    (d) Sodium sulphate
50. A substance 'X' turns red litmus blue. It is:
    (a) an Acid

    (b) a Base

    (c) Neutral

    (d) None

51. A reaction in which energy is absorbed is known as ______ reaction.
52. The digestion of food in our body is an example of ______ reaction.
53. Rusting of iron is a ______ process while freezing of water is a ______ process.
54. When quick lime reacts with water, a large amount of ______ is released.
55. The precipitate formed when barium chloride reacts with sodium sulphate is ______.
56. The green colour of ferrous sulphate crystals changes to ______ on heating.
57. The burning of magnesium ribbon in air is an example of ______ reaction.
58. ______ is used to prevent the rancidity of oil containing food packets.
59. The chemical formula of marble is ______.
60. The reaction of Iron nail with Copper Sulphate solution is a ______ reaction.

61. Oxidation is the gain of hydrogen or loss of oxygen.
62. Respiration is an endothermic reaction.
63. Silver chloride when kept in sunlight turns grey.
64. A complete chemical equation represents the reactants, products and their physical states.
65. Magnesium ribbon is cleaned before burning to remove the layer of basic magnesium carbonate.
66. Precipitation reactions produce soluble salts.
67. Decomposition of calcium carbonate is used in the manufacture of cement.
68. Corrosion of copper causes a black coating on it.
69. Antioxidants are added to food to prevent oxidation.
70. Double displacement reactions involve exchange of ions between two reactants.

Q71-75. Match the Reactions:

Q76-80. Match the Characteristic Colour:

81. Name the gas burnt with a 'pop' sound.
82. What is the chemical name of rust?
83. Name the process by which fat/oil containing food items change their taste and smell.
84. Which law is followed by balancing a chemical equation?
85. What is the colour of blue litmus paper in an acidic gas?

Assertion-Reason (Q86-100): Mark: (a) Both A and R are true and R is correct explanation of A. (b) Both A and R are true but R is NOT correct explanation. (c) A is true, R is false. (d) A is false, R is true.

86. Assertion (A): Decomposition of vegetable matter into compost is an endothermic reaction.
    Reason (R): Decomposition reaction involves breakdown.
87. Assertion (A): Zinc reacts with sulphuric acid to form zinc sulphate and hydrogen gas.
    Reason (R): Zinc is more reactive than hydrogen.
88. Assertion (A): Chips bags are flushed with nitrogen.
    Reason (R): Nitrogen is an antioxidant gas.
89. Assertion (A): AgCl turns grey in sunlight.
    Reason (R): Photolytic decomposition occurs.
90. Assertion (A): Rusting is endothermic.
    Reason (R): Heat is released in rusting.
91. Assertion (A): $MnO_2 + 4HCl$ is redox.
    Reason (R): $MnO_2$ is reduced.
92. Assertion (A): Mg burns in Nitrogen.
    Reason (R): Mg forms Nitride.
93. Assertion (A): Lead Nitrate gives brown fumes.
    Reason (R): Nitrogen dioxide is brown.
94. Assertion (A): Corrosion of iron causes loss.
    Reason (R): Iron oxide is flaky.
95. Assertion (A): Milk to Curd is chemical change.
    Reason (R): New substance formed.
96. Assertion (A): Burning candle is physical change.
    Reason (R): Wax melts.
97. Assertion (A): Sodium stored in kerosene.
    Reason (R): Highly reactive with air.
98. Assertion (A): Zinc is reducing agent in reaction with CuSO4.
    Reason (R): Zn loses electrons.
99. Assertion (A): Respiration is exothermic.
    Reason (R): Energy released.
100. Assertion (A): Digestion is decomposition.
     Reason (R): Complex molecules break down.