The difference in number of water molecules in gypsum and plaster of paris is
A
5/2
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B
2
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C
1/2
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D
3/2
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Solution
The correct option is D 3/2 Gypsum is calcium sulphate with 2 moles of water and plaster of paris has 1/2moles of water. The difference is 3/2 moles of water.