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Standard IX

Chemistry

Molecular Mass

Assertion :At...

Question

Assertion :At $50^{\circ}, p H$ of pure water is less than 7. Reason: Ionic product of water increases with increase of temperature.

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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Assertion is incorrect but Reason is ncorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$P_{H} = - l o g [H^{+}]$

Thus, as temperature increases , $[H^{+}]$ increases, -log $[H^{+}]$ decreases

Therefore $p H$ decreases.

Thus both assertion and reason are correct and the reason is the correct explanation of assertion.

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Similar questions

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.

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

Assertion (A) o-nitrophenol is less soluble in water than the m- and p-isomers.
Reason (R) m and p-nitrophenols exist as associated molecules.
(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. Assertion: The impurities such as

{SiO}_{2}

present in iron ore is removed by

{CaCO}_{3}

.

Reason:

CaO

formed by decomposition of

{CaCO}_{3}

reacts with

{SiO}_{2}

to form slag.

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Assertion :At 50∘,pH of pure water is less than 7. Reason: Ionic product of water increases with increase of temperature.

Assertion :At $50^{\circ}, p H$ of pure water is less than 7. Reason: Ionic product of water increases with increase of temperature.