Question

Assertion (A): Gypsum can be used to manage sub-soil acidity.
Reason (R): The \(\text{SO}_4^{2-}\) released by dissolution of gypsum increases level of Ca and reduces level of Al in both soil solution and exchange complex.
Choose the correct answer from the options given below:

• A. (A) is true but (R) is false.
• B. (A) is False but (R) is True.
• C. Both (A) and (R) are correct, and (R) is correct explanation of (A).
• D. Both (A) and (R) are correct but (R) is not correct explanation of (A).

Hint:

Unlike lime (\(\text{CaCO}_3\)), gypsum does not increase soil pH because it does not generate hydroxyl ions (\(\text{OH}^-\)). Instead, it mitigates acid-soil damage by detoxifying active aluminum through sulphate complexation.

Answer 1

The Correct Option is C