A) \[\frac{5}{2}\]
B) 2
C) \[\frac{1}{2}\]
D) \[1\frac{1}{2}\]
Correct Answer: D
Solution :
Formula of gypsum \[=CaS{{O}_{4}}.2{{H}_{2}}O\] Formula of plaster of Paris \[=CaS{{O}_{4}}.\frac{1}{2}{{H}_{2}}O\] Thus, difference of water molecule \[=2{{H}_{2}}O-\frac{1}{2}{{H}_{2}}O=1\frac{1}{2}{{H}_{2}}O\]
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