Assertion -If water is heated to 50-C then pH will increase Reason- Kw increases with decrease in temperature

The correct option is D Both Assertion and Reason are incorrect K_w #160;increases with increase in temperature as with the increase in temp. more no. o ...

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Standard XII

Chemistry

Auto Protolysis of Water

Assertion :If...

Question

Assertion :If water is heated to $50^{\circ} C$ then $p H$ will increase Reason: $K_{w}$ increases with decrease in 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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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
$K_{w}$ increases with increase in temperature as with the increase in temp. more no. of molecules dissociate and ionic product increases.
As Kw increases, so $p H$ of neutral water decreases.
like pH is 7 at $25^{o} C$ and it becomes 6 at $80^{o} C$ .

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Assertion :If water is heated to 50∘C then pH will increase Reason: Kw increases with decrease in temperature

The correct option is D Both Assertion and Reason are incorrectKw increases with increase in temperature as with the increase in temp. more no. of molecules dissociate and ionic product increases.As Kw increases, so pH of neutral water decreases.like pH is 7 at 25oC and it becomes 6 at 80oC.

Assertion :If water is heated to $50^{\circ} C$ then $p H$ will increase Reason: $K_{w}$ increases with decrease in temperature