Which of the following is correct for free expansion P of ideal gas...

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Which of the following is correct for free expansion
P of ideal gas under isothermal condition:

W
(1) q \( =0, \Delta \mathrm{T}0, \mathrm{w}0 \)
(2) \( \mathrm{q}=0, \Delta \mathrm{T}=0, \mathrm{w}=0 \)
(3) \( \mathrm{q} \neq 0, \Delta \mathrm{T}=0, \mathrm{w}=0 \)
(4) \( \mathrm{q} \neq 0, \Delta \mathrm{T}=0, \mathrm{w} \neq 0 \)
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