Question

On heating gypsum loses certain percentage of its water content and becomes

Answer 1

gypsum-------CaSO₄·2H₂O

upon heating to 100°C, gysum loses 1$\frac{1}{2}$ water and turns to "PLASTER OF PARIS" i.e. CaSO₄·$\frac{1}{2}$H₂O

if gypsum is heated further, it loses all its water and becomes dead burnt plaster