(i) Write the chemical formula of each of the following:
(a) Plaster of paris
(b) Gypsum
(ii) How can plaster of paris be converted into gypsum.
(iii) List any one use of plaster of paris.

Explanation

(i) (a) `CaSO_4. 1/2 H_2O`
(b) `CaSO_4. 2H_2O`
(ii) BY mixing with water
`CaSO_4. 1/2H_2O+1 1/2H_2OtoCaSO_4. 2H_2O`
(iii) For making toys for supporting fractured bones.