Question

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: Many of the world's historic buildings, monuments and statues are degraded/defaced due to exposure to acidic rain water.
Reason R: Reaction between limestone and sulphuric acid in rain water produces water soluble product Gypsum which is easily washed away and leave behind pitted surface.

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

Hint:

Chemical reaction to remember: $CaCO_3 \text{ (Limestone)} + H_2SO_4 \text{ (Acid Rain)} \rightarrow CaSO_4 \text{ (Gypsum)} + H_2O + CO_2$. The loss of solid $CaCO_3$ is what causes the visible "pitting."

Answer 1

The Correct Option is A