How is plaster of paris prepared?

Plaster of paris is

How is plaster of Paris chemically different from Gypsum ? How can they be inter -converted ? Write two uses of plaster of paris.

(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.

State the chemical name of plaster of paris . Write a chemical equation to show the reaction between plaster of paris and water.