A) Plaster of Paris is obtained by the partial oxidation of gypsum.
B) The percentage of plaster of calcium in gypsum is less than plaster of Paris.
C) Gypsum is obtained by the plaster of Paris on heating.
D) Plaster of Paris is obtained by the addition of water in gypsum.
Correct Answer: B
Solution :
The percentage of plaster of calcium in gypsum\[(CaS{{O}_{4}}.2{{H}_{2}}O)\]is less than plaster of Paris \[\left( CaS{{O}_{4}}.\frac{1}{2}{{H}_{2}}O \right)\] \[\underset{gypsum}{\mathop{2CaS{{O}_{4}}.2{{H}_{2}}O}}\,\xrightarrow[{}]{\Delta }\underset{plaster\text{ }of\text{ }Paris}{\mathop{{{(CaS{{O}_{4}})}_{2}}.{{H}_{2}}O}}\,+3{{H}_{2}}O\]
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