Assertion :Gypsum is added to powdered clinkers to get cement. Reason: Addition of gypsum to clinker decreases its setting time and thus cement hardens readily on mixing with water.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Gypsum is added to powdered clinkers to get cement. Addition of gypsum to clinker decreases its setting time and thus cement hardens readily on mixing with water.

During the grinding process of cement, the clinker is mixed with 3-5 % of gypsum with certain dispersing and water proofing agents and then ground to a fine powder.

Thus, Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Hence, the correct option is $A$

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