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

JEE Main · 2023 · 08 Apr 2023 · Shift 2 · s-Block Elements

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 :

(A)4
(B)2✓ Correct
(C)3
(D)1

Answer: (B)

Solution

In a good quality cement the lime must be properly balanced against the acidic oxides of silicon, aluminium and iron. The ratio of lime to the sum of these three oxides is kept close to two, which gives correct setting and good strength. A ratio far from this value produces weak or unsound cement. The required ratio is close to two.

JEE Main · 2023 · 08 Apr 2023 · Shift 2 · Single correct option

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