Question

Assertion: pH of an aqueous solution decreases from 4 to 2.

Reason: The acidic character of the solution increases.

• A. Both assertion and reason are correct and the reason is the correct explanation of the assertion.
• B. Both assertion and reason are correct but the reason is not the correct explanation of the assertion.
• C. The assertion is correct but the reason is incorrect
• D. The assertion is incorrect but the reason is correct

Answer 1

The correct option is A

Both assertion and reason are correct and the reason is the correct explanation of the assertion.

Explanation for assertion statement:

1. pH is the measure of the hydronium ions(H₃O⁺) present in a solution.
2. If the pH of the solution is less than 7, the solution is acidic in nature.
3. Lower the pH stronger is the acidic character.
4. If the pH of the solution is more than 7, the solution is basic in nature.
5. For neutral solution, the pH value is 7.

Explanation for the reason statement:

The pH of a solution decreases when the acidity of the solution increases.

Thus, both assertion and reason are correct and the reason is the correct explanation for the assertion.

Hence, the correct option is (A).