During the melting of a slab of ice at `273K` at atmospheric pressure :-

Options

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

Answer

B, C

Explanation

There is a decrease in volume during melting of an ice slab. Therefore negative work is done by the ice- water system on to the surrounding `implies W =-ve`
Heat is absorbed during melting
`implies Q = +ve implies DeltaU = Q -W = +ve`