Question

The chemical formula for gypsum is :

• A. $CaS{O}_4$
• B. $CaS{O}_4.2H_{2}O$
• C. $CaS{O}_4.H_{2}O$
• D. $2CaS{O}_4.3H_{2}O$
  

Answer 1

The correct option is B $CaS{O}_4.2H_{2}O$

The chemical formula for gypsum is $\left(CaS{O}_4.2H_{2}O\right)$.
Gypsum $\left(CaS{O}_4.2H_{2}O\right)$ on heating to about ${120}^{\circ }\text{C}$ forms plaster of paris.