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Assertion:Phase transition involves change in internal energy only.
Reason:Phase transition occurs at constant pressure.
A. If both ther assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both the assertion and reason are true but reason is not the correct explantion of the assertion.
C. If the assertion is true but reason is false.
D. If assertion is false but reason is true.

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Correct Answer - A
Phase transition occurs at constant `P` and thus change is referred as `DeltaH` .

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