p-Block elementsHard

Question

The approximate percentage of silica in cement is:

Options

A.5 - 10%
B.15 - 20%
C.20 - 25%
D.25 - 30%

Solution

The approximate composition of cement is :
Lime (CaO) = 50 - 60%
Silica (SiO2) = 20 - 25%
Alumina (Al2O3) = 5 - 10%
Magnesia (MgO) = 2 - 3%
Ferric oxide (Fe2O3) = 2 - 3%

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