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Chemical Reactions

Chemical Reactions

10 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

When iron nails are placed in blue coloured solution of copper sulphate, the solution turns green. Which type of chemical reaction does it represent?

  1. Decomposition
  2. Displacement
  3. Combination
  4. Oxidation
Question 2 Multiple Choice (Single Answer)

Which of the following statements are true regarding a catalyst?
I.          It is a substance which increases the rate of reaction.
II.         It is a substance which reduces the activation energy.
III.        It is a substance which increases the activation energy.
IV.       It is a substance which is consumed in the reaction.

  1. I and II
  2. II and III
  3. III and IV
  4. I and IV
Question 3 Multiple Choice (Single Answer)

Which of the following represents a chemical change?

  1. Evaporation of water
  2. Sublimation of iodine
  3. Heating a platinum wire in Bunsen flame
  4. Heating of mercuric oxide powder
Question 4 Multiple Choice (Single Answer)

In reaction: P4O10 + 6H2O � 4H3PO4, the oxide of phosphorous act as

  1. a reducing agent
  2. a catalyst
  3. a basic anhydride
  4. an acidic anhydride
Question 5 Multiple Choice (Single Answer)

Balancing of chemical equation is done in accordance with

  1. law of conservation of mass
  2. law of constant proportion
  3. law of reciprocal proportion
  4. all of the above
Question 6 Multiple Choice (Single Answer)

Consider the following partial ionic reaction:
S2 + 32H2O � 8SO4- + 64H+ + 48e-
The equivalent weight of sulphur is

  1. 32/6
  2. 32/48
  3. 32/8
  4. 32
Question 7 Multiple Choice (Single Answer)

Which of the following can be considered as weak electrolyte?

  1. NaCI
  2. HCI
  3. CH3COOH
  4. K2SO4
Question 8 Multiple Choice (Single Answer)

Which of the following is not a redox reaction?

  1. Br2 + 2KI � 2KBr + I2
  2. 3Cu + 8HNO3 � 3Cu (NO3)2 + 2NO + 4H2O
  3. CaO + 2HCl � CaCl2 + H2O
  4. MnO2 + 4HCl � MnCl2 + Cl2 + 2H2O
Question 9 Multiple Choice (Single Answer)

In which of the following ions the oxidation state of chlorine is +5?

  1. CIO4-
  2. CIO3-
  3. CI2O7
  4. CIO-
Question 10 Multiple Choice (Single Answer)

A solution of ammonium chloride in water

  1. turns blue litmus red
  2. turns red litmus blue
  3. does not affect litmus
  4. decolourises litmus
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