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The compound which is largely responsible for initial setting and early strength gain of Ordinary Portland Cement is

1. C3A
2. C3S
3. C2S
4. C4AF

Correct answer: C3S

Solution

C3S, or tricalcium silicate, is the primary compound in Ordinary Portland Cement that contributes to the initial setting and early strength gain due to its rapid hydration properties.

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