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Question

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


A
15
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B
2
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C
12
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D
112
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Solution

The correct option is D 112
Molecular formula of gypsum: CaSO4.2H2O

Molecular formula of plaster of paris: CaSO4.12H2O

So, difference between the number of water molecules
=212=112

Chemistry

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