The number of molecules of water of crystallisation present in washing soda crystals is:

five

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two

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ten

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seven

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Solution

The correct option is D ten
The chemical formula of washing soda is ${N a}_{2} {C O}_{3} \cdot 10 H_{2} O$ . It is sodium carbonate decahydrate. So it contains 10 water molecules.

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The number of molecules of water of crystallisation present in washing soda crystals is :

(a) five

(b) two

(d) seven

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