Class 10 Chemistry

Acid Base and Salt

NCERT Exemplar Solution MCQ 1

What happens when a solution of an acid is mixed with a solution of a base in a test tube?

  • The temperature of the solution increases.
  • The temperature of the solution decreases.
  • The temperature of the solution remains the same.
  • Salt formation takes place
  • (i) only
  • (i) and (iii)
  • (ii) and (iii)
  • (i) and (iv)
    Answer: (d) (i) and (iv)

  • An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?
    • Baking powder
    • Lime
    • Ammonium hydroxide solution
    • Hydrochloric acid
      Answer: (d) Hydrochloric acid
  • During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to
    • absorb the evolved gas
    • moisten the gas
    • absorb moisture from the gas
    • absorb Cl ions from the evolved gas
      Answer: (c) absorb moisture from the gas
  • Which of the following salts does not contain water of crystallisation?
    • Blue vitriol
    • Baking soda
    • Washing soda
    • Gypsum
      Answer: (b) Baking soda
  • Sodium carbonate is a basic salt because it is a salt of
    • strong acid and strong base
    • weak acid and weak base
    • strong acid and weak base
    • weak acid and strong base
      Answer: (d) Weak acid and strong base
  • Calcium phosphate is present in tooth enamel. Its nature is
    • basic
    • acidic
    • neutral
    • amphoteric
      Answer: (c) neutral

  • A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue?
    • Lemon juice
    • Vinegar
    • Common salt
    • An antacid
      Answer: (d) An antacid
  • Which of the following gives the correct increasing order of acidic strength?
    • Water < Acetic acid < Hydrochloric acid
    • Water < Hydrochloric acid < Acetic acid
    • Acetic acid < Water < Hydrochloric acid
    • Hydrochloric acid < Water < Acetic acid
      Answer: (a) Water < Acetic acid < Hydrochloric acid
  • If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?
    • Wash the hand with saline solution
    • Wash the hand immediately with plenty of water and apply a paste of sodium hydrogencarbonate
    • After washing with plenty of water apply solution of sodium hydroxide on the hand
    • Neutralise the acid with a strong alkali
      Answer: (b) Wash the hand immediately with plenty of water and apply a paste of sodium hydrogen carbonate.

  • Sodium hydrogencarbonate when added to acetic acid evolves a gas. Which of the following statements are true about the gas evolved?
    • It turns lime water milky
    • It extinguishes a burning splinter
    • It dissolves in a solution of sodium hydroxide
    • It has a pungent odour
    • (i) and (ii)
    • (i), (ii) and (iii)
    • (ii), (iii) and (iv)
    • (i) and (iv)
      Answer: (a) (i) and (ii)

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