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In the average composition of portland cement, the percentage of magnesium oxide is a ___________(a) 3 to 4%(b) 2 to 3%(c) 4 to 5%(d) 1 to 2%I got this question during an online exam.This is a very interesting question from s-Block Elements topic in division s-Block Elements of Chemistry – Class 11

Answer»

Correct choice is (b) 2 to 3%

To elaborate: Cement is an important building MATERIAL. The average composition of portland cement is calcium oxide of 50 to 60%, SILICON DIOXIDE of 20 to 25%, aluminium oxide of 5 to 10%, magnesium oxide of 2 to 3%, ferric oxide of 1 to 2% and sulphur trioxide of 1 to 2%.



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