Assertion :Molarity of pure water is 55.55 M at 298 K. Reason: Molarity is temperature dependent.

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 correct.

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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.
Mass of one litre of solution is 1000gm.
moles of water $= 1000 / 18 = 55.55$ mole
so, molarity $= 55.5 / 1 = 55.55 M$ .

As the molarity involved volume term so it is temperature dependant.

Hence option B correct

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