For a good quality cement, the ratio of silica to alumina is found to be
p-Block Elements (Class 11) · Class 11 · JEE Main Previous Year Question
For a good quality cement, the ratio of silica to alumina is found to be
- a
1.5
- b
4.5
- c
2
- d✓
3
3
Strategy: Recall the standard composition ratio of silica to alumina for good-quality Portland cement.
Step 1: Cement Composition Requirement For good quality cement, the ratio (called the Silica Modulus) must be maintained in the range of 2.5 to 4.0. This ensures correct setting time and strength.
Step 2: Evaluation Among the options:
- 1.5 → too low (excess alumina, flash set)
- 2 → below optimal range
- 3 → falls within the optimal range ✅
- 4.5 → slightly above optimal range
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