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STD 11 - 5. Thermodynamics and thermochemistry — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 - 5. Thermodynamics and thermochemistry4 Marks
MCQ
A reaction occurs spontaneously if
  • A
    $T\Delta S < \Delta H$ and both $\Delta H$ and $\Delta S$ are $+ve$
  • ✓
    $T\Delta S > \Delta H$ and both $\Delta H$ and $\Delta S$ are $+ve$
  • C
    $T\Delta S = \Delta H$ and both $\Delta H$ and $\Delta S$ are $+ve$
  • D
    $T\Delta S > \Delta H$ and $\Delta H$ is $+ve$ and $\Delta S$ is $-ve$
✓

Answer

Correct option: B.
$T\Delta S > \Delta H$ and both $\Delta H$ and $\Delta S$ are $+ve$
(b) For spontaneous reaction $\Delta G$ should be negative $\Delta G = \Delta H - T\Delta S = ( + ve) - T( + ve)$

If $T\Delta S > \Delta H$ then $\Delta G$ will be negative and reaction will be spontaneous.

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