For a good quality cement, the ratio of lime to the total of the oxides of $\mathrm{Si}, \mathrm{Al}$ and $\mathrm{Fe}$ should be as close as to :
Solution
For good quality cement, the ratio of lime (CaO) to the sum of the oxides of silicon (SiO₂), aluminum (Al₂O₃), and iron (Fe₂O₃) should be approximately 2:1.
<br/><br/>
This proportion ensures that the cement has good strength and setting properties, as well as resistance to chemical attack.
About this question
Subject: Chemistry · Chapter: s-Block Elements · Topic: Alkali Metals
This question is part of PrepWiser's free JEE Main question bank. 96 more solved questions on s-Block Elements are available — start with the harder ones if your accuracy is >70%.