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  1. Which substance is used to retard the setting action of cement?

    2. A.

     CaO
    B.

     Al2O3
    C.

     CaSO4.2H2O
    D.

     Na2O + K2O

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    Answer : Option C

    Explanation :

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

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