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JIPMER 2014
Exam
JIPMER
Year
2014
Subject
Chemistry
Chapter
Electrochemistry

JIPMER 2014 · Chemistry · Electrochemistry

If the E_ cell ^ for a given reaction has a negative value then...

If the E_{\text{cell }^{\circ}foragivenreactionhasanegativevaluethenwhichofthefollowinggivesthecorrectrelationshipsforthevaluesoffor a given reaction has a negative value then which of the following gives the correct relationships for the values of\Delta G^{\circ}andandK_{eq \text{eq }}??

Options

  1. AΔG∘<0;Keq >1\Delta G^{\circ} < 0 ; K_{\text{eq }}>1
  2. BΔG∘<0;Keq <1\Delta G^{\circ} < 0 ; K_{\text{eq }} < 1
  3. CΔG∘>0;Keq <1\Delta G^{\circ}>0 ; K_{\text{eq }} < 1
  4. DΔG∘>0;Keq >1\Delta G^{\circ}>0 ; K_{\text{eq }}>1

Correct answer

C. ΔG∘>0;Keq <1\Delta G^{\circ}>0 ; K_{\text{eq }} < 1

Step-by-step solution

ΔG∘=−nFE∘\Delta G^{\circ}=-n F E^{\circ} When E∘E^{\circ} is negative, then ΔG∘>0ΔG∘=−RT\Delta G^{\circ}>0 \Delta G^{\circ}=-R T in KeqK_{\mathrm{eq}} When, ΔG∘>0,Keq =10−x\Delta G^{\circ}>0, K_{\text{eq }}=10^{-x} which is less than one, i.e., Keq <1K_{\text{eq }} < 1.
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