Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Gypsum is used for making fireproof wall boards.
Reason (R): Gypsum is unstable at high temperatures. In the light of the above statements, choose the correct answer from the options given below:

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

(A) is correct but(R) is not correct

(A) is not correct but (R) is correct

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

answer is C.

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Detailed Solution

Gypsum is CaSO₄ 2H₂O.
Gypsum is used for making fire proof wall boards due to its heat resistant property as it has a non-combustible core that contains chemically combined water.
Gypsum when heated to 393K is converted to plaster of Paris and above 473 K, it gives dead burnt gypsum.

Hence both (A) and (R) are correct but the reason is not correct for the assertion.

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