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Q.

The difference in number of water molecules in gypsum and plaster of paris is

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a

2

b

3/2

c

5/2

d

1/2

answer is D.

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Detailed Solution

Gypsum is calcium sulphate with 2 moles of water and

Plaster of paris has 1/2 moles of water. The difference is 3/2 moles of water.

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