Whic do not contain water of crystallisation

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Solution

Q.
Which of the following salts do not contain water of crystallisation

1 Blue vitriol

2 Baking soda

3 Washing soda

4 Gypsum

Ans.
(2)

Baking soda is sodium bicarbonate $(N a H C O_{3})$ in anhydrous form without any water of crystallisation.
Other options:
Blue Vitriol: It is hydrated salt of copper sulphate containing 5 molecules of water of crystallisation $(C u S O_{4} \cdot 5 H_{2} O)$ .
Washing soda: It is hydrated salt of sodium carbonate containing 10 molecules of water of crystallisation $(N a_{2} C O_{3} \cdot 10 H_{2} O) .$
Gypsum: It is hydrated salt of calcium sulphate containing 2 molecules of water of crystallisation $(C a S O_{4} \cdot 2 H_{2} O)$ .

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