For a good quality cement, the ratio of silica to alumina is found to be :
Solution
For good quality cement, the ratio of silica $\left(\mathrm{SlO}_2\right)$ to Alumina $\left(\mathrm{Al}_2 \mathrm{O}_3\right)$ should be between 2.5 to 4.
About this question
Subject: Chemistry · Chapter: p-Block Elements · Topic: Group 13: Boron Family
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