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A sample of portland cement contain 23% SiO2 , 3% Al2O3 and 2% Fe2O3 then what would be its silica module (n) ?

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A sample of portland cement contain 23% SiO2 , 3% Al2O3 and 2% Fe2O3 then what would be its silica module (n) ?

(a)  3.83

(b)  28

(c)  21.73

(d)  4.6

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Correct option  (d) 4.6

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