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NEET 2005
Exam
NEET
Year
2005
Subject
Chemistry
Chapter
Thermodynamics (C)

NEET 2005 · Chemistry · Thermodynamics (C)

The reaction occurs spontaneously if :

The reaction occurs spontaneously if :The reaction occurs spontaneously if :The reaction occurs spontaneously if :

Options

  1. ATΔS<ΔH\mathrm{T} \Delta \mathrm{S} < \Delta \mathrm{H} and both ΔH\Delta \mathrm{H} and ΔS\Delta \mathrm{S} are +ve+\mathrm{ve}
  2. BTΔS>ΔH\mathrm{T} \Delta \mathrm{S}>\Delta \mathrm{H} and ΔH\Delta \mathrm{H} is + ve and ΔS\Delta \mathrm{S} is −ve-\mathrm{ve}
  3. CTΔS>ΔH\mathrm{T} \Delta \mathrm{S}>\Delta \mathrm{H} and both ΔH\Delta \mathrm{H} and ΔS\Delta \mathrm{S} are +ve+\mathrm{ve}
  4. DTΔS=ΔH\mathrm{T} \Delta \mathrm{S}=\Delta \mathrm{H} and both ΔH\Delta \mathrm{H} and ΔS\Delta \mathrm{S} are + ve

Correct answer

C. TΔS>ΔH\mathrm{T} \Delta \mathrm{S}>\Delta \mathrm{H} and both ΔH\Delta \mathrm{H} and ΔS\Delta \mathrm{S} are +ve+\mathrm{ve}

Step-by-step solution

ΔG=ΔH−TΔSΔG=−ve\Delta \mathrm{G}=\Delta \mathrm{H}-\mathrm{T} \Delta \mathrm{S}\Delta \mathrm{G}=-v e for spontaneous reaction When ΔS=+ve,ΔH=+ve\Delta \mathrm{S}=+v e, \Delta \mathrm{H}=+v e and TΔS>ΔH⇒ΔG=−ve Related Theory \mathrm{T} \Delta \mathrm{S} \gt \Delta \mathrm{H}\Rightarrow \Delta \mathrm{G}=-v e\text{ Related Theory }The reaction occurs spontaneously if :
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