JEE Main · 2023 · 15 Apr 2023 · Shift 1 · s-Block Elements

For a good quality cement, the ratio of silica to alumina is found to be

(A)3✓ Correct
(B)4.5
(C)2
(D)1.5

Answer: (A)

Solution

For a good quality Portland cement the proportion of silica to alumina is held within a narrow band, roughly 2.5 to 4 by mass. A value of about 3 lies near the middle of this band and gives cement of good strength and proper setting behaviour. The silica-to-alumina ratio for good quality cement is therefore 3.

JEE Main · 2023 · 15 Apr 2023 · Shift 1 · Single correct option

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