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

1. A. q = 0, ΔT < 0 and w > 0
2. B. q < 0, ΔT = 0 and w = 0
3. C. q > 0, ΔT > 0 and w > 0
4. D. q = 0, ΔT = 0 and w = 0

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