The Sblock Elements Ques 42
42. Identify the correct statement
(a) gypsum is obtained by heating plaster of Paris
(b) plaster of Paris can be obtained by hydration of gypsum
(c) plaster of paris is obtained by partial oxidation of gypsum
(d) gypsum contains a lower percentage of calcium than plaster of Paris
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Answer:
Correct Answer: 42.(d)
Solution:
(d) Gypsum is $CaSO_4 \cdot 2 H_2 O$ and plaster of Paris is $(CaSO_4)_2 \cdot H_2 O$. Therefore, gypsum contains a lower percentage of calcium than plaster of Paris.
BETA
