Assertion :When small amount of acid or base is added to pure water, its pH undergoes a change. Reason: Addition of an acid or a base increases the degree of ionisation of water.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
For water, $K_{w} = [H^{+}] [O H^{-}] = 10^{- 14}$ is always constant at a given temperature. It doesn't change with the addition of acid or base but the concentration of hydrogen ions or hydroxide ions changes on addition of acid or base because of that $p H$ changes.

Addition of an acid or a base doesn't affect the degree of ionisation of water

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Similar questions

Assertion (A) Addition reaction of water to but-1-ene in acidic medium yields butan-1-ol.
Reason (R) Addition of water in acidic medium proceeds through the formation of primary carbocation.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Q. 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.

Q. Assertion
If BOD level of water in reservoir is less than 5 ppm it is not polluted.

Reason
High biological oxygen demand means low activity of bacteria in water.

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

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(c) Assertion is correct, but reason is incorrect
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Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

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