Question

Assertion: In aqueous solution pH +pOH= $p{K}_w$ (not 14) at all temperatures.

Reason: Water dissociates more at higher temperatures.

• A. Both Assertion and Reason are true and Reason is the correct explanation of Assertion
• B. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
• C. Assertion is true but Reason is false
• D. Assertion is false but Reason is true
• E. Both Assertion and Reason are false

Answer 1

The correct option is D Assertion is false but Reason is true

In general, in aqueous solution pH +pOH= $p{K}_w$ (not 14) at all temperatures.
At ${25}^{0}C$, pH +pOH= $p{K}_w=14$ .
As the temperature increases, the dissociation of water increases and the value of $p{K}_w$ decreases.