Assertion :Third law of thermodynamics is confined to pure crystalline solids. Reason: Theoretical arguments and practical evidence have shown that entropy of solutions and super cooled liquids is not zero at 0 K.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
According to the third law of thermodynamics, "The entropy of a perfectly crystalline substance at zero K or absolute zero is taken to be zero".
So according to the statement , both assertion and reason are correct and the reason is the correct explanation of assertion.

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