A) \[\frac{5}{2}\]
B) \[2\]
C) \[\frac{1}{2}\]
D) \[1\frac{1}{2}\]
Correct Answer: D
Solution :
Molecular formula of gypsum is\[CaS{{O}_{4}}-2{{H}_{2}}O\]while plaster of Paris is \[CaS{{O}_{4}}\frac{1}{2}{{H}_{2}}O\]. Hence, difference in number of water molecules in gypsum and plaster of Paris is \[=2-\frac{1}{2}=\frac{3}{2}=1\frac{1}{2}\]
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