For the following Assertion and Reason, the correct option is :
Assertion : The pH of water increases with increase in temperature.
Reason : The dissociation of water into \(\mathrm{H^+}\) and \(\mathrm{OH^-}\) is an exothermic reaction.
Assertion : The pH of water increases with increase in temperature.
Reason : The dissociation of water into \(\mathrm{H^+}\) and \(\mathrm{OH^-}\) is an exothermic reaction.
Show Hint
- Both assertion and reason are false.
- Both assertion and reason are true, but the reason is not the correct explanation for the assertion.
- Both assertion and reason are true, and the reason is the correct explanation for the assertion.
- Assertion is not true, but reason is true.
The Correct Option is A
Solution and Explanation
By Le Chatelier's principle, raising the temperature shifts the equilibrium to the right, so \(K_w\) increases (\(10^{-14}\) at 25 C to about \(5.5\times10^{-13}\) at 100 C).
For pure water \([\mathrm{H^+}]=\sqrt{K_w}\) increases, so pH = \(-\log[\mathrm{H^+}]\) decreases (about 7 to 6.13). The Assertion is false.
Both statements are false.
Answer: (1) Both assertion and reason are false.
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