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(A) : CaSO4 is called dead burnt gypsum because it does not set with water.
(R) : Mixture of 1 part of slaked lime, 3 parts of sand and water is known as mortar.

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(A) is true but (R) is false

Both (A) and (R) are true but (R) is not the correct explanation of (A)

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

answer is B.

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Detailed Solution

CaSO4 is called dead burnt gypsum, because it loses the properties of setting with water, means dead burnt gysum on warming with water remains as it is
1 part of slaked lime + 3 parts of sand and water is called mortar

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