Assertion (A): During the melting of 1gr ice at 0°C , at 1 atm pressure into water, the change in internal energy is greater than 80 Cal.
Reason (R) : During the melting of ice work is done on the ice.

During melting, of a slab of ice at 273K at the atmospheric pressure, the ice is about to convert into water on slight increase in temperature. The internal energy of water is higher than that of ice. As a result, internal energy of ice-water system increases. Also, the volume decreases. So work done i.e. −PΔV become positive.