Question

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 :

• A. (A) is not correct but (R) is correct
• B. Both ( A ) and ( R ) are correct and ( R ) is not the correct explanation of ( A )
• C. Both (A) and (R) are correct but (R) is the correct explanation of (A)
• D. (A) is correct but (R) is not correct

Hint:

Carefully consider the relationship between the assertion and the reason. Even if both statements are individually correct, the reason may not necessarily be the correct explanation for the assertion.

Answer 1

The Correct Option is B

Step-by-step Solution and Explanation:

Assertion (A): Gypsum is used for making fireproof wall boards.

Reason (R): Gypsum is unstable at high temperatures.

1. Understanding Gypsum:
   Gypsum is a mineral composed of calcium sulfate dihydrate (CaSO₄·2H₂O). It is widely used in construction for building materials, such as drywall or plasterboard, which are commonly used as wallboards.
2. Properties of Gypsum:
   Gypsum is known for its ability to withstand fire and heat to some extent due to its dihydrate form. When exposed to heat, gypsum releases its water content as steam, which can help retard the progress of fire. This property makes gypsum an excellent choice for fireproofing materials like wallboards.
3. Analyzing the Assertion (A):
   The assertion correctly states that gypsum is used for making fireproof wallboards. This is due to its ability to release water when heated, helping in fire resistance.
4. Examining the Reason (R):
   The reason states that gypsum is unstable at high temperatures. While gypsum can lose its water and decompose at high temperatures, this property is not directly responsible for its use in making fireproof wallboards. Instead, the water release property aids in fire resistance.
5. Conclusion:
   Both statements are factually correct; gypsum is used in fireproofing, and it can decompose at high temperatures. However, the reason (R) does not logically explain why gypsum is used for fireproof wallboards.
   Thus, the correct answer is: Both (A) and (R) are correct and (R) is not the correct explanation of (A).