A compound which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water. Identify the compound and write its chemical formula. Write the chemical equation for its preparation. Mention any one use of the compound.

The name of the compound is Plaster of Paris. Its chemical formula is CaSO4. ½ H2O.
Equation:
CaSO4.2H2O → CaSO4. ½ H2O + 1 ½ H2O
This compound is used in the hospitals mainly as plastering for supportive layer of fractured bones in the getting right position.