Q.
A. The percentage of calcium is lower in gypsum in comparison to plaster of Paris.
B. Gypsum is not a natural product, It is obtained by heating of plaster of Paris.
C. Plaster of Paris is obtained by hydration of gypsum.
D. Plaster of Paris is formed by oxidation of gypsum.
E. None of the above
Correct choice: A
Explanation: