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Byju's Answer

Standard XII

Chemistry

Auto Protolysis of Water

A If water is...

Question

(A) If water is heated to 350 K, then pOH will increase to 8.
(R) $K_{w}$ increases with increase in temperature.

Both (R) and (A) are true and reason is the. correct explanation of assertion

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Both (R) and (A) are true but reason is not correct explanation of assertion

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Assertion (A) is true but reason (R) is false

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Assertion (A) and reason (R) both are false

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Assertion (A) is false but reason (R) is true

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Solution

The correct option is A Both (R) and (A) are true and reason is the. correct explanation of assertion
If water is heated to 350 K, then pOH will increase to 8.
$K_{w}$ increases with increase in temperature. As $K_{w}$ increases pOH increases, pH decreases.

So both (R) and (A) are true and reason is the. correct explanation of assertion.
Hence option A is correct.

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Similar questions

Q. Assertion:
(A)

\to

When water is heated to

80^{\circ} C

then concentrations

[H^{+}] a n d [O H^{-}]

will increase.
Reason:
(R)

\to K_{w}

increases with decrease in temperature.

Q. Assertion (A): pH of pure water increases with increase in temperature. Reason (R): Self ionization of water is an endothermic reaction. Which of the following is correct?

Q. Assertion (A)

\sqrt{8}

is an irrational number.
Reason (R)
If m is a natural number which is not a perfect square, then

\sqrt{m}

is irrational.

(a) Both Assertion (A) and Reason (R) are true and Reason (R) is a correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not correct explanation of Assertion (A).
(c) Assertion (A) is true and Reason (R) is false.
(d) Assertion (A) is false and Reason (R) is true.

(a) Both Assertion (A) and Reason (R) are true and Reason (A) and Reason (R). For selecting the correct answer, use the following code :

(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not a correct explanation of Assertion (A).

(d) Assertion (A) is false and Reason (R) is true.

$\begin{matrix} Assertion (A) & Reason (R) \sqrt{3} i s a n i r r a t i o n a l n u m b e r . & T h e s u m o f a r a t i o n a l n u m b e r a n d a n i r r a t i o n a l n u m b e r i s a n i r r a t i o n a l n u m b e r . \end{matrix} The correct answer is: (a)/(b)/(c)/(d).$

This question consists of two statements, namely, Assertion (A) and Reason (R). For selecting the correct answer, use the following code:

(a) Both Assertion (A) and Reason (R) are true and Reason (R) correct explanation of Assertion (A).

(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not a correct explanation of Assertion (A).

(d) Assertion (A) is false and Reason (R) is true.

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(A) If water is heated to 350 K, then pOH will increase to 8. (R) Kw increases with increase in temperature.

(A) If water is heated to 350 K, then pOH will increase to 8.
(R) $K_{w}$ increases with increase in temperature.