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)