\( \mathrm{P} \) If one mole of an ideal gas \( \left(C p, m=\frac{...

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\( \mathrm{P} \)
If one mole of an ideal gas \( \left(C p, m=\frac{5}{2} R\right) \) is
W expanded isothermally at \( 300 \mathrm{~K} \) until it's volume is tripled, then change in entropy is (Note:- Expansion is carried out freely \( ( \) Pext \( =0) \) )
(1) zero
(2) infinity
(3) \( R \ln 3 \)
(4) None
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