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For a good quality cement, the ratio of silica to alumina should be between

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10 and 15

0.1 and 2.2

50 and 65

2.5 and 4

answer is D.

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Detailed Solution

For a good quality cement, the ratio of Al₂O₃ to SiO₂ should lie between 2.5 to 4
$\frac{A l_{2} O_{3}}{S i O_{2}} = 2.5 to 4$

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