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Question

Potash alum contains ___________ number of water molecules.

A
24
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B
22
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C
20
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D
25
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Solution

The correct option is B 24
Potash Alum (K2SO4Al2(SO4)3.24H2O) is a colourless, odourless and crystalline substance. Its crystals are prepared by mixing concentrated solutions of potassium sulphate and aluminium sulphate. It is soluble in water. It contains 24 molecules of water.

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