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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