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

Options

A. (a)Positive work is done by the ice-water system on the atmosphere .
B. (b)Positive work is done on the ice-water system by the atmosphere.
C. (c)The internal energy of ice- water system increase
D. (d)The internal energy of the ice-water system decreases

Answer

B, C

Explanation

`Q = DeltaU + W`
`Q = +ve`, as heat is absorbed from the atmosphere
`W= -ve` as the volume decreases
`therefore DeltaU = Q -W = +ve - (-ve)= +ve`
`therefore` Internal energy increases.