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

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
In isolated system, find the condition for spontaneous reaction.
  • A
    $\Delta U =0, \,\Delta S =0,\, \Delta G =0$
  • B
    $\Delta U < 0 , \,\Delta S > 0, \,\Delta G < 0 $
  • C
    $\Delta U =0,\, \Delta S > 0,\, \Delta G < 0$
  • ✓
    $\Delta U < 0,\, \Delta S < 0,\, \Delta G < 0$
✓

Answer

Correct option: D.
$\Delta U < 0,\, \Delta S < 0,\, \Delta G < 0$
d
For an isolated system, the change in energy $(\Delta U )$ remains zero.

For a spontaneous reaction, change in entropy $(\Delta S )$ remains greater than zero and change in free energy $(\Delta G )$ remains less than zero.

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