A) by adding water to calcium sulphate
B) by adding sulphuric acid to calcium hydroxide
C) by heating gypsum to a very high temperature
D) by heating gypsum to 373 K.
Correct Answer: D
Solution :
\[CaS{{O}_{4}}.2{{H}_{2}}O\xrightarrow{\Delta }CaS{{O}_{4}}.\frac{1}{2}{{H}_{2}}O+\frac{3}{2}{{H}_{2}}O\]
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