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Question

Which of the following salts does not contain water of crystallisation ?
  1. Blue viltriol
  2. Baking soda
  3. Washing soda
  4. Gypsum

A
Baking soda
B
Washing soda
C
Blue viltriol
D
Gypsum
Solution
Verified by Toppr

Blue vitriol is copper sulphate pentahydrate CuSO45H2O. It has 5 moles of water.
Washing soda is sodium carbonate monohydrate Na2CO3H2O
Gypsum is calcium sulphate dihydrateCaSO42H2O. It can be used as a fertilizer,a main constituent in many forms of plaster and in blackboard chalk.
Baking soda is sodium bicarbonate in anhydrous form without any water of crystallisation and it is widely used as dry fire extinguisher because of its alkali nature.

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