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24. For free expansion of the gas which of the following is true

(a) Q=W=0      and ΔEint =0

(b)  Q=0,W>0 and ΔEint =-W

(c)  W=0,Q>0,  and ΔEint = Q

(d) W>0,Q<0  and ΔEint =0

Ans. a

(8)

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