Assertion :pH of boiling water is less than the water at $4^{0} C$ Reason: The density of water is maximum at $4^{0} C$ .

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
pH of boiling water is less than the water at $4^{0} C$
At boiling temperature $100^{0} C$ , the degree of dissociation of water is higher than the degree of dissociation at $4^{0} C$ .
Hence, the hydrogen ion concentration is higher at $100^{0} C$ that at $4^{0} C$ and hence lower pH.
The density of water is maximum at $4^{0} C$ . This is because the volume of water for given mass is minimum at $4^{0} C$ .
Hence, both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion :pH of boiling water is less than the water at 40C Reason: The density of water is maximum at 40C.

Assertion :pH of boiling water is less than the water at $4^{0} C$ Reason: The density of water is maximum at $4^{0} C$ .