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 H- and nbsp- OH- an exothermic reaction-Assertion is not true- but reason is true-Both assertion and reason are true and the reason is the correct explanation for the assertion-Both assertion and reason are false-Both assertion and reason are true- but the reason is not the correct explanation for the assertion-

The correct option is C Both assertion and reason are false.H_2O → H^+ + OH^ is an endothermic process. On increasing the temperature, the value of K_w incre ...

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Byju's Answer

Standard XII

Chemistry

Auto Protolysis of Water

For the follo...

Question

For the following Assertion and Reason, the correct option is:
Assertion: The $p H$ of water increases with increase in temperature.

Reason: The dissociation of water into $H^{+}$ and $O H^{-}$ an exothermic reaction.

Both assertion and reason are false.

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Assertion is not true, but reason is true.

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Both assertion and reason are true and the reason is the correct explanation for the assertion.

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Both assertion and reason are true, but the reason is not the correct explanation for the assertion.

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Solution

The correct option is A Both assertion and reason are false.
$H_{2} O \to H^{+} + O H^{-}$ is an endothermic process.

On increasing the temperature, the value of $K_{w}$ increases which will result in decrease in $p K_{w}$ . So we can say that $p H$ of water will decrease on increasing temperature because $p H$ for water $= \frac{1}{2} p K_{w} .$

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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 H+ and OH− an exothermic reaction.

The correct option is A Both assertion and reason are false.H2O→H++OH− is an endothermic process. On increasing the temperature, the value of Kw increases which will result in decrease in pKw. So we can say that pH of water will decrease on increasing temperature because pH for water =12pKw.

For the following Assertion and Reason, the correct option is:
Assertion: The $p H$ of water increases with increase in temperature.

Reason: The dissociation of water into $H^{+}$ and $O H^{-}$ an exothermic reaction.