Alumina silica lime and iron oxide are the basic raw material...

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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

A. 5CaO . 3Al₂O₃

B. 3CaO . Al₂O₃

C. 3CaO . SiO₂

D. 2CaO . SiO₂

Answer: Option A

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