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5. Thermodynamics and thermochemistry — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
The incorrect expression among the following is :
  • A
    $\frac{{\Delta {G_{system}}}}{{\Delta {S_{total}}}} =  - T$
  • B
    In isothermal process, $w_{reversible} =-nRT \,ln\,\frac{V_f}{V_i}$
  • ✓
    $\ln K = \frac{{\Delta {H^o} - T\Delta {S^o}}}{{RT}}$
  • D
    $K=e^{-Delta ^o/RT}$
✓

Answer

Correct option: C.
$\ln K = \frac{{\Delta {H^o} - T\Delta {S^o}}}{{RT}}$
c
$\Delta G^{\circ}=\Delta H^{\circ}-T \Delta S^{\circ}$

$-R T \ell n K=\Delta H^{\circ}-T \Delta S^{\circ}$

$\ell n K=-\frac{\Delta H^{\circ}-T \Delta S^{\circ}}{R T}$

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