A) \[{{(CaS{{O}_{4}})}_{2}}.{{H}_{2}}O\]
B) \[CaS{{O}_{4}}.\frac{1}{2}{{H}_{2}}O\]
C) \[CaS{{O}_{4}}.\,\,2{{H}_{2}}O\]
D) \[CaS{{O}_{4}}\]
Correct Answer: C
Solution :
Gypsum is dihydrated calcium sulphate, i.e.,\[CaS{{O}_{4}}.2{{H}_{2}}O\].
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