Question

Assertion :$pH$ of pure water increases with increase in temperature. Reason: Degree of dissociation of water increases with increase in temperature.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is D Assertion is incorrect but Reason is correct

As temperature increases the degree of dissociation of water increases, thus water dissociates to give more $\left[H^{+}\right]$, and hence its pH decreases.

Thus Assertion is incorrect but reason is correct.