How many water molecules are present in one molecule of Epsom salt?
7

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Solution

The correct option is A 7
Water of crystallisation is the fixed number of water molecules present in one formula unit of a salt. Chemical formula of Epsom salt is ${MgSO}_{4} . 7 H_{2} O$ .

Therefore, the number of water molecules present in one molecule of Epsom salt is 7. Hence, it is also called magnesium sulphate heptahydrate.

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