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Q.

What is the molecular formula of plaster of paris?

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a

2CaSO4·H2O

b

2CaSO4·2H2O

c

CaSO4·2H2O

d

CaSO4.3H2O

answer is A.

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Detailed Solution

 When gypsum is heated at about 120-140 degrees we get plaster of paris

Plaster of Paris is also known as Calcium sulphate hemihydrate.

Plaster of paris is  usually used as a cast to hold ornamental plasterworks, in sculpting and bandages etc

CaSO4·12H2O is the formula of plaster of paris.

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