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Third Law of Thermodynamics

Assertion :ST...

Question

Assertion :STATEMENT 1 (Assertion)- Absolute value of H cannot be determined Reason: STATEMENT 2 (Reason)- $Δ H_{(g)} = Δ E_{(g)} + Δ n_{(g)} R T .$

Statement 1 is True, statement 2 is True; statement 2 is a correct explanation for statement 1.

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Statement 1 is True, statement 2 is True; statement 2 is not a correct explanation for statement 1.

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Statement 1 is True, statement 2 is False.

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Statement 1 is False, statement 2 is True.

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Solution

The correct option is B Statement 1 is True, statement 2 is True; statement 2 is not a correct explanation for statement 1.
As $△ H = △ E + △ (P V) = △ E + △ (n R T) = △ E + n R △ T$ (because for a gaseous system PV = nRT).

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