Q.

Formulae of gypsum and plaster of Paris differ by:

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a

32 molecules of H2O

b

12 molecule of H2O

c

2 molecules of H2O

d

1 molecule of H2O

answer is C.

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Detailed Solution


Plaster of Paris is made from Gypsum. Gypsum contains calcium sulfate dihydrate (CaSO4·2H2O) and plaster of Paris contains calcium sulfate hemihydrates (CaSO4·0.5 H2O)

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