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Which of the following is/are incorrect

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Major ingredient in Portland cement is tricalcium silicate.

$C a {(O H)}_{2}$ is used in whitewash because it is white in colour

The purpose of adding gypsum to clinker to form cement is to increase the rate of process of setting of the cement

Dead burnt plaster has a remarkable property of setting with water

answer is B, C, D.

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