A) \[CaO\]
B) \[A{{l}_{2}}{{O}_{3}}\]
C) \[CaS{{O}_{4}},2{{H}_{2}}O\]
D) \[N{{a}_{2}}O+{{K}_{2}}O\]
Correct Answer: C
Solution :
\[CaS{{O}_{4}}.2{{H}_{2}}O\] (gypsum) is added to cement clinker to retard setting action of cement.
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