Question

Plaster of Paris is represented by

• A. $CaSO_{4}.2H_{2}O$
• B. $CaSO_{4}.3H_{2}O$
• C. $CaSO_{4}.H_{2}O$
• D. $CaSO_{4}.\frac{1}{2}H_{2}O$

Answer 1

Answer: (D)

Plaster of paris is calcium sulfate hemihydrate, it is quicksetting gypsum.
$CaSO_{4}.\frac{1}{2}H_{2}O$ or $\left(\right.CaSO_{4}\left(\left.\right)_{2}.H_{2}O$