Write the name and formula of one salt each which contains:
(a) two molecules of water of crystallisation
(b) five molecules of water of crystallisation
(c) ten molecules of water of crystallisation

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Solution

(a) Gypsum $(C a S O_{4} . 2 H_{2} O)$ contains two molecules of water of crystallisation.

(b) Copper sulphate crystals $(C u S O_{4} . 5 H_{2} O)$ contains five molecules of water of crystallisation.

(c) Sodium carbonate crystal $(N a_{2} C O_{3} . 10 H_{2} O)$ contains ten molecules of water of crystallisation.

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