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Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following.

1. q = 0, Δ T < 0, w ≠ 0
2. q ≠ 0, Δ T = 0, w = 0
3. q = 0, Δ T ≠ 0, w = 0
4. q = 0, Δ T = 0, w = 0

Correct answer: q = 0, Δ T = 0, w = 0

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