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

1. q = 0, ΔT < 0 and w > 0
2. q < 0, ΔT = 0 and w = 0
3. q > 0, ΔT > 0 and w > 0
4. q = 0, ΔT = 0 and w = 0

Correct answer: q = 0, ΔT = 0 and w = 0

Solution

In free expansion of an ideal gas under adiabatic conditions, no heat is exchanged (q = 0), no work is done (w = 0), and the temperature remains constant (ΔT = 0) because internal energy does not change.

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