Q. Gypsum, ${CaSO}_{4}.2H_{2}O$ on heating to about $120℃$ forms a compound which has the chemical composition represented by
A) ${CaSO}_{4}.H_{2}O$
B) $2{CaSO}_{4}.3H_{2}O$
C) $2{CaSO}_{4}.H_{2}O$
D) ${CaSO}_{4}$
Explanation
(c)
$2\left( {CaSO}_{4} \bullet 2H_{2}O \right)\ \underset{Dehydration}{\overset{\ \ \ \ \ \ \ \ \ \ 120℃\ \ \ \ \ \ \ \ \ \ }{\rightarrow}}\ 2CaSO_{4} \bullet H_{2}O + 3H_{2}O$
gypsum plaster of Paris
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.