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The change in the entropy of a 1 mole of an ideal gas which went through an isothermal process from an initial state \( \left(P_{1}, V_{1}, T\right) \) to the final state \( \left(P_{2}, V_{2}, T\right) \) is equal to [BHU 2006]
\( \mathrm{P} \)
(a) Zero
(b) \( R \ln T \)
W
(c) \( R \ln \frac{V_{1}}{V_{2}} \)
(d) \( R \ln \frac{V_{2}}{V_{1}} \)
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