Question

Assertion: Lesser the pH of the solution, the more will be its acidic strength.

Reason: pH of a solution is inversely proportional to its [H⁺] concentration.

• 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 the assertion statement:

This statement is true because;

1. Strong acids have their pH in the range of 0-1.
2. Weaker acids have a higher pH in the range of 3.5 to 6.

Explanation for the reason statement:

This statement is true as-

1. pH is the negative logarithm of the hydronium ion(H₃O⁺) concentration.
2. $pH=-\log \left[H_3{O}^{+}\right]$
3. Therefore, as the acidity increases the concentration of hydronium ions also increases, and hence, the pH decreases.

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

Therefore, option A is correct.