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The correct option for free expansion of an ideal gas under adiabatic condition is:

(1) q = 0, $\Delta$T = 0 and w = 0

(2) q = 0, $\Delta$T < 0 and w > 0

(3) q < 0, $\Delta$T = 0 and w = 0

(4) q > 0, $\Delta$T > 0 and w > 0
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Ans: (1) q = 0, ΔT = 0 and w = 0

Sol: For adiabatic process q=0, for free expansion w=0 and there will be no change in temperature gradient (ΔT=0).

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