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Chemistry in Every Day Life

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  1. Which substance is used to retard the setting action of cement?
    1. CaO
    2. Al2O3
    3. CaSO4, 2H2O
    4. Na2O + K2O
Correct Option: C

CaSO4, 2H2O (Gypsum) is added to cement clinker to retard setting action of cement.


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