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Chemical Reaction and Chemical Bond 4 Chemical Reaction and Chemical Bond 4

Posted on August 18, 2025August 18, 2025 By admin

Chapter Chemical Reaction and Chemical Bond-4

Chapter Chemical Reaction and Chemical Bond-4 Chapter Chemical Reaction and Chemical Bond-4 Chapter Chemical Reaction and Chemical Bond-4

1 / 118

1. What is a chemical reaction?

2 / 118

2. What are the substances that participate in a chemical reaction called?

3 / 118

3. Consider the following statements:

  1. During a chemical reaction, new products are formed.
  2. New atoms are formed during a chemical reaction.

Which of the above is/are incorrect?

4 / 118

4. Which of the following changes may occur during a chemical reaction?

 

5 / 118

5. Which of the following changes is not a chemical change?

 

6 / 118

6.Who takes part in a chemical reaction?

7 / 118

7.In which of the following changes does a chemical reaction take place?

  1. Milk turning sour
  2. Digestion of food in the human body
  3. Boiling of water
  4. Ripening of fruits
  5. Burning of fuel

Choose the correct code:

8 / 118

8.Which statement about a chemical reaction is NOT correct?

 

9 / 118

Consider the following statements:

  1. A chemical reaction can take place only in a laboratory.
  2. No chemical reaction occurs in the human body.

Which of the above statements is/are correct?

10 / 118

10.As a result of a chemical reaction, which of the following does not change?

11 / 118

11.When chemical reactions are expressed in a brief form, it is called —

12 / 118

12.In a chemical equation, if the number of each type of atom on both the left and right sides is the same, then that chemical equation will be —

13 / 118

13.Which of the following information is not obtained from a chemical equation?

14 / 118

14.From a chemical equation, which of the following information about the reaction can be obtained?

15 / 118

15.The concept of a balanced chemical equation is in accordance with which scientific principle?

16 / 118

16.Consider the following chemical equation and choose the correct statement: 2CO+O2​⟶2CO2​

17 / 118

17.Which of the following statements about a chemical equation is false?

18 / 118

18.Which of the following is not a balanced chemical equation?

19 / 118

19.Which of the following statements is correct?

20 / 118

21 / 118

21.Which of the following is a combination reaction?

22 / 118

22.On heating calcium carbonate, calcium oxide and carbon dioxide are formed. This reaction is of which type?

23 / 118

23.Consider the following statements—

  1. In a decomposition reaction, a chemical substance breaks down into two or more new substances.
  2. A decomposition reaction takes place with the help of heat, light, or electrical energy.
  3. A decomposition reaction is an endothermic reaction.

Which of the above statements is/are correct?

24 / 118

24.Which of the following is an exothermic reaction?

25 / 118

25.Consider the following statements—

  1. The nature of a combination reaction is exothermic.
  2. The nature of a decomposition reaction is endothermic.

Which of the above statements is/are correct?

26 / 118

27 / 118

27.During the electrolysis of a metal oxide, oxygen gas is released at —

28 / 118

29 / 118

29.When ammonia is burned in oxygen, which gas is formed?

30 / 118

30.What is obtained from the thermal decomposition of lead nitrate?

31 / 118

31.What type of chemical reaction takes place between sodium hydroxide and hydrochloric acid?

32 / 118

32.On heating KClO₃, which gas is released?

33 / 118

33.Consider the following reaction:
CaO+H2​O→Ca(OH)2​+heat

34 / 118

34.The chemical reaction in which heat is produced along with the product is called —

35 / 118

35.The following chemical reaction is of which type?

4NH3​+5O2​→4NO+6H2​O

36 / 118

36.Which of the following metals will displace iron from ferrous sulfate solution?

37 / 118

37.Which of the following is not a decomposition reaction?

38 / 118

38.Silver chloride is kept in a dark brown bottle because:

39 / 118

39.Which of the following is an endothermic reaction?

40 / 118

40.When water is electrolyzed, the mole ratio of hydrogen and oxygen gases released is:

41 / 118

41.A piece of iron is dipped in an aqueous solution of copper sulfate. After 30 minutes, how will the color of the solution change?

42 / 118

42.When citric acid is added to a purple potassium permanganate (KMnO4KMnO_4KMnO4​) solution, how does the color change?

43 / 118

43.When sulfur dioxide (SO2)gas is passed into an acidic potassium dichromate (K2Cr2O7) solution, what will be the color change?

44 / 118

44. Between which of the following displacement reaction cannot occur?

45 / 118

45.When a magnesium ribbon is burned in the presence of nitrogen gas, which compound is formed?

46 / 118

46.Which of the following metals will displace copper from a copper sulfate (CuSO4CuSO_4CuSO4​) solution?

47 / 118

47.What is the name of the external substance used to prevent fats and oily foods from getting rancid?

48 / 118

48.Which of the following is a combustion reaction?

49 / 118

49.When quick lime (CaO) reacts with water,

50 / 118

50.To preserve fresh oil for a long time, which of the following gases is used?

51 / 118

51.When a light green powdery substance is heated, a gas with a pungent smell is released, and a brown solid remains. What type of reaction is this?

52 / 118

52.When slaked lime (Ca(OH)₂) solution is used for whitewashing walls, the shine of the wall increases. Which substance is responsible for this increase in shine?

53 / 118

53.When molten sodium chloride (NaCl) is electrolyzed, which of the following observations will be noticed?

54 / 118

54.In a test tube, a small amount of barium hydroxide is taken, and a little ammonium chloride is added. The mixture is stirred with a glass rod. Which of the following statements about this reaction is correct?

55 / 118

55.Identify the false statement among the following:

56 / 118

55.A clean aluminum sheet is dipped in an aqueous solution of zinc sulfate. After about 20 minutes, when the aluminum sheet is taken out, a shiny gray layer is deposited on it. What does this indicate?

57 / 118

57.When a copper wire is dipped into a solution of silver nitrate, a shiny layer of silver is deposited on the copper wire. What does this reaction indicate?

58 / 118

58.Which of the following phenomena is related to a chemical reaction?

59 / 118

60 / 118

60.Consider the following statements:

  1. Magnesium can burn in the presence of nitrogen gas.
  2. Antimony powder can be burned in the presence of chlorine gas.
  3. A burning candle goes out when placed in a vessel filled with chlorine gas.

Which of the above statements are correct?

61 / 118

61.Which of the following substances can burn in the presence of CO with the release of heat and light?

62 / 118

62.The chemical reactions that can occur in both directions are called:

63 / 118

63.When a shiny brownish element is heated in air, its color turns black. Which of the following elements is this?

64 / 118

64.Consider the following statements:

  1. A chemical reaction in which a reactant exists in more than one oxidation state is called a redox reaction.
  2. In the Haber process for the production of ammonia, a redox reaction takes place.

Which of the above statements is/are correct?

65 / 118

65.After a chemical reaction starts, over time:

66 / 118

66.To start a chemical reaction, reactants need to be brought to an active or excited state by supplying extra heat (energy). This energy is called:

67 / 118

67.Which of the following factors does not affect the rate of a chemical reaction?

68 / 118

68.The rate of reaction of a substance:

69 / 118

69.In a chemical equilibrium:

70 / 118

70.When a solid reactant is broken into smaller pieces, the rate of reaction:

71 / 118

71.The rate of many chemical reactions increases or decreases in the presence of some external substance. This external substance is:

72 / 118

72.Catalysts are substances that:

73 / 118

73.In a chemical reaction, the role of a catalyst is to change —

74 / 118

74.Which of the following statements about a catalyst is correct?

  1. It increases the rate of the reaction.
  2. It increases the activation energy.
  3. It decreases the activation energy.
  4. It gets consumed in the reaction.

Code:

75 / 118

75.Consider the following statements:

  1. When the catalyst, reactants, and products are all in the same physical state, the catalyst is called a homogeneous catalyst.
  2. A heterogeneous catalyst is one in which the catalyst and reactants are in different physical states.

Which of the above statements is/are correct?

76 / 118

76.Substances that destroy the activity of a catalyst in chemical reactions are called –

77 / 118

77.The nature of a catalyst poison is –

78 / 118

78.How does a catalyst poison work?

79 / 118

79.What is the role of a positive catalyst in a chemical reaction?

80 / 118

80.When potassium chlorate is heated, it decomposes into potassium chloride and oxygen. When manganese dioxide is added, the reaction becomes faster. The reason is:

81 / 118

81.A negative catalyst is one which—

82 / 118

82.Among the following, which type of elements are the best catalysts?

83 / 118

83.If in a reaction, one of the products itself acts as a catalyst, what is it called?

84 / 118

84. Catalyst Enhancer –

85 / 118

85. A catalyst promoter works by –

86 / 118

86. What is called a biological catalyst?

87 / 118

87. Which of the following statements is correct?

88 / 118

88. Consider the following statements:

  1. Enzymes are complex nitrogen-containing inorganic compounds.
  2. Enzymes are specific in nature.

Which of the above statements is correct?

89 / 118

89. Which of the following statements is correct?

90 / 118

90. In a molecule AB, if the charge distribution is A⁺ B⁻, then this molecule is –

91 / 118

91. An ionic bond is formed when –

92 / 118

92. An electrovalent (ionic) bond is formed –

93 / 118

93. A covalent bond is formed due to –

94 / 118

94. Consider the following statements:

  1. An ionic bond is formed between metal and non-metal atoms.
  2. A covalent bond is formed between non-metal atoms.

Which of the above statements is correct?

95 / 118

95. Example of a covalent compound –

96 / 118

96. Example of an ionic compound –

97 / 118

97. The types of bonds present in CuSO₄·5H₂O are –

98 / 118

98. Hydrogen has a tendency to gain one electron to achieve the electronic configuration of helium. This tendency is similar to –

99 / 118

100. A cation is formed when –

100 / 118

99. An atom that gains an electron –

101 / 118

101. The maximum covalency of sulfur is –

102 / 118

102. Which of the following compounds does NOT have an ionic bond?

103 / 118

103. Which of the following is a covalent compound?

104 / 118

104. A compound in which ionic, covalent, and coordinate (dative) bonds are all present –

105 / 118

105. Covalent compounds have low melting and boiling points because –

106 / 118

106. Consider the following statements:

  1. Chemical reactions between ionic compounds are slow.
  2. Chemical reactions between covalent compounds are fast.

Which of the above statements is/are correct?

107 / 118

107.Which of the following molecules has a covalent bond?

108 / 118

108.The melting and boiling points of ionic compounds are high because –

109 / 118

109.When a chemical bond is formed, what happens?

110 / 118

110.When two atoms of the same element combine, the nature of the bond between them is –

111 / 118

111.Which of the following compounds does not have hydrogen bonding?

112 / 118

Which of the following exhibits hydrogen bonding?

113 / 118

114. What is the reason for the high boiling point of water?

114 / 118

115.Which of the following has a covalent bond?

115 / 118

Hydrogen chloride (HCl) is a gas, but hydrogen fluoride (HF) is a low boiling liquid, because –

116 / 118

117 / 118

Consider the following statements:

  1. Breaking chemical bonds is an endothermic reaction.
  2. Formation of chemical bonds is an exothermic reaction.

Which of the above statements is/are correct?

118 / 118

119 Molten sodium chloride can conduct electricity because it contains –

Your score is

The average score is 87%

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