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

(a)  Positive work is done by ice-water system on the atmosphere

(b)  Positive work is done on the 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

Ans. b,c

(9)

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