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Assertion: The increase in internal ener...

Assertion: The increase in internal energy `(DeltaE)` for the vaporisation of 1 mole of water at 1 atm and `373K` is zero.
Reason: For all isothermal processes `DeltaE=0` .

A

If the both assertion and reason are true and the reason is the correct explanation of the assertion

B

If both assertion and reason are true and the reason is not the correct explanation of the assertion

C

If assertion is true but reason is false

D

If both assertion and reason are false statements.

Text Solution

Verified by Experts

The correct Answer is:
A
At 373 K or `100^@c` the water starts boiling and at this temperature the vaporization of water is an isothermal process.
The internal energy change `(DeltaE)`, depend only on temperature, it follows that at constant temperature, the internal energy of the gas remains constant, i.e. `DeltaE` is zero.
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