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(B) The quality of Portland cement is determined by the ratio of lime $(CaO)$ to the total of the acidic oxides ($SiO_2$,$Al_2O_3$,and $Fe_2O_3$).This

Vedclass · Accepted Answer

$2$

Vedclass · Answer

(B) The quality of Portland cement is determined by the ratio of lime $(CaO)$ to the total of the acidic oxides ($SiO_2$,$Al_2O_3$,and $Fe_2O_3$).This ratio is given by the formula: $\frac{\% CaO}{\% SiO_2 + \% Al_2O_3 + \% Fe_2O_3} \approx 2.0$.For a good quality cement,this ratio should be between $1.9$ and $2.1$,which is closest to $2$.Therefore,option $(B)$ is correct.

For a good quality cement,the ratio of lime to the total of the oxides of $Si$,$Al$ and $Fe$ should be as close as to :

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