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  1. Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of portland cement. The component of Portland cement which first hardens is

    2. A.
    5CaO . 3 Al2O3
    B.
    3CaO . Al2O3
    C.
    3CaO . SiO2
    D.
    2CaO . SiO2

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    Answer : Option A

    Explanation :

    No answer description available for this question.

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