During the melting of a slab of ice at 273K at atmospheric pressure,

Options

A. positive work is done by ice-water system on the atmosphere
B. positive work is done on ice-water system by the atmosphere
C. the internal energy of the ice-water system increases
D. the internal energy of the ice-water system decreases

Answer

B, C

Explanation

Since on melting of ice volume decreases. So atmosphore is doing `+ve` work on ice water system.
`DeltaQ=DeltaU+(-DeltaW)implies DeltaUgt0 because DeltaQgt0`