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JIPMER 2007
Exam
JIPMER
Year
2007
Subject
Chemistry
Chapter
Thermodynamics (C)

JIPMER 2007 · Chemistry · Thermodynamics (C)

A reaction occurs spontaneously if

A reaction occurs spontaneously if

Options

  1. ATΔS<ΔHT \Delta S \lt \Delta H and both ΔH\Delta H and ΔS\Delta S are + ve
  2. BTΔS>ΔHT \Delta S\gt\Delta H and both ΔH\Delta H and ΔS\Delta S are + ve
  3. CTΔS=ΔHT \Delta S=\Delta H and both ΔH\Delta H and ΔS\Delta S are + ve
  4. DTΔS>ΔHT \Delta S\gt\Delta H and ΔH\Delta H is + ve and ΔS\Delta S is - ve

Correct answer

B. TΔS>ΔHT \Delta S\gt\Delta H and both ΔH\Delta H and ΔS\Delta S are + ve

Step-by-step solution

The spontaneity of reaction is based upon the negative value of ΔG,ΔG\Delta G, \Delta G is based upon T,ΔST, \Delta S and ΔH\Delta H according to following equation (Gibbs-Helmholtz equation) ΔG=ΔH−TΔS\Delta G=\Delta H-T \Delta S If the magnitude of ΔH−TΔS\Delta H-T \Delta S is negative, then the reaction is spontaneous. when TΔS>ΔHT \Delta S\gt\Delta H and ΔH\Delta H and ΔS\Delta S are + ve, then ΔG\Delta G is negative.
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