Question

White chemical compound becomes hard on mixing proper quantity of water. It is also used in surgery to repair fractured bones

Answer 1

Plaster of Paris (CaSO4.1/2H2O) also called calcium sulphate hemi hydrate becomes hard on mixing proper quantity of water. It gets converted into a hard mass called gypsum(CaSO4.2H2O) also called calcium sulphate di hydrate.

It is used is surgery to repair fractured bones.

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Answer 2

The Chemical Compound is Plaster of peris .Calcium Sulphate hemihydrated (CaSO4.1/2H20).
It is used for fracture of hand,neck etc in medical.