Acid, Base and Salt

Subject matter experts of JagranJosh have developed chapter wise practice questions as per the relevancy of the chapter in the CBSE board exam. This practice set contains 10 questions with detailed explanations on “Chapter: Acid, Base and Salt” of Science.

• Q8.Which among the following represents the chemical formula for ‘Plaster of Paris’?

  A) $${\text{CaSO}}_{\text{4}}{\text{.2H}}_{\text{2}}\text{O}$$
  B) $${\text{CaSO}}_{\text{4}}\text{.}\frac{1}{2}{\text{H}}_{\text{2}}\text{O}$$
  C) $${\text{CaSO}}_{\text{4}}{\text{.H}}_{\text{2}}\text{O}$$
  D) $${\text{CaSO}}_{\text{4}}{\text{.10H}}_{\text{2}}\text{O}$$
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• Q9.Which one of the following salts will dissolve in water to form an alkaline solution?

  A) Potassium carbonate
  B) Sodium chloride
  C) Sodium sulphate
  D) Potassium sulphate
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• Q10.Copper sulphate crystals when heated strongly, lose their water of crystallization to give anhydrous copper sulphate accompanied by a change in color from:

  A) Blue to green
  B) Blue to white
  C) Blue to sky blue
  D) Blue to grey
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• Q11.What happens when a solution of an acid is mixed with a solution of a base in a test tube?
  (i) The temperature of the solution increases.
  (ii) The temperature of the solution decreases.
  (iii) The temperature of the solution remains the same.
  (iv) Salt formation takes place.

  A) Only (i)
  B) (i) and (iii)
  C) (ii) and (iii)
  D) (i) and (iv)
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• Q12.An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?

  A) Baking powder
  B) Lime
  C) Ammonium hydroxide solution
  D) Hydrochloric acid
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• Q13.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

  A) Absorb the evolved gas
  B) Moisten the gas
  C) Absorb moisture from the gas
  D) Absorb Cl- ions from the evolved gas
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• Q14.Which of the following salts does not contain water of crystallisation?

  A) Blue vitriol
  B) Baking soda
  C) Washing soda
  D) Gypsum
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