A) \[CaS{{O}_{4}}.\,{{H}_{2}}O\]
B) \[CaS{{O}_{4}}\]
C) \[CaS{{O}_{4}}.2{{H}_{2}}O\]
D) \[2CaS{{O}_{4}}.{{H}_{2}}O\]
Correct Answer: D
Solution :
The structural formula of plaster of Pairs is \[2CaS{{O}_{4}}.{{H}_{2}}O\]or \[(CaS{{O}_{4}}.1\text{/}2{{H}_{2}}O)\]. It can be prepared by heating gypsum. \[\underset{\text{gypsum}}{\mathop{CaS{{O}_{4}}.2{{H}_{2}}O}}\,\xrightarrow{\Delta }\underset{\text{plaster}\,\text{of}\,\text{Pairs}}{\mathop{CaS{{O}_{4}}\cdot \frac{1}{2}{{H}_{2}}O}}\,+\frac{3}{2}{{H}_{2}}O\]
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