A) The product becomes very hard
B) The product becomes very soft
C) A shining surface is obtained
D) The colour of product will change
Correct Answer: A
Solution :
\[CaS{{O}_{4}}\cdot \frac{1}{2}{{H}_{2}}O\]is plaster of Paris and becomes very hard when we add water to it. This hard mass called gypsum. \[CaS{{O}_{4}}\cdot \frac{1}{2}{{H}_{2}}O+1\frac{1}{2}{{H}_{2}}O\to CaS{{O}_{4}}\cdot 2{{H}_{2}}O+\text{Heat}\] The setting of plaster of Paris is exothermic process.
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