Statement-1 : Change in internal energy in the melting process is due to change in internal potential energy.
Statement-2 : This is because in melting, distance between molecules increases but temperature remains constant.

Options

A. If both, Assertion and Reason are true and Reason is the correct explanation of the Asserrion.
B. If both,Assertion and Reason are true but Reason is not a correct explanation of the Assertion.
C. If Assertion is true but the Reason is false.
D. If both, Assertion and Reason are false.

Answer

A

Explanation

In an adiabatic process, no exchange of heat is permissible i.e., `dQ=0`.
As `dQ=dU+dW=0 :. dU= -dW`
Statement-1 is true. Statement-2 is true and statement- 2 is correct explanation of statement-1