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Question: Answered & Verified by Expert
Which of the following statements/relationships is not correct in thermodynamic changes ?
ChemistryThermodynamics (C)JEE MainJEE Main 2013 (23 Apr Online)
Options:
  • A
    $\Delta \mathrm{U}=0$ (isothermal reversible expansion of a gas)
  • B
    $\mathrm{w}=-\mathrm{nRT} \ln \frac{\mathrm{V}_2}{\mathrm{~V}_1}$ (isothermal reversible expansion of an ideal gas)
  • C
    $\mathrm{w}=\mathrm{nRT} \ln \frac{\mathrm{V}_2}{\mathrm{~V}_1}$ (isothermal reversible expansion of an ideal gas)
  • D
    For a system of constant volume heat involved directly changes to internal energy.
Solution:
1909 Upvotes Verified Answer
The correct answer is:
$\mathrm{w}=\mathrm{nRT} \ln \frac{\mathrm{V}_2}{\mathrm{~V}_1}$ (isothermal reversible expansion of an ideal gas)
For isothermal reversible expansion.
$$
w=-n R T \ln \frac{V_2}{V_1}
$$

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