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NEET 2016
Exam
NEET
Year
2016
Subject
Chemistry
Chapter
Electrochemistry

NEET 2016 · Chemistry · Electrochemistry

If the E _ cell ^ o for a given reaction has a negative value,...

If the Ecello{E}_{cell}^{o} for a given reaction has a negative value, which of the following gives the correct relationship for the values of ∆Go∆ {G}^{o} and Keq{K}_{eq}?

Options

  1. A∆Go>0;Keq<1∆ {G}^{o} > 0; {K}_{eq} < 1
  2. B∆Go>0;Keq>1∆ {G}^{o} > 0; {K}_{eq} > 1
  3. C∆Go<0;Keq>1∆ {G}^{o} < 0; {K}_{eq} > 1
  4. D∆Go<0;Keq<1∆ {G}^{o} < 0; {K}_{eq} < 1

Correct answer

A. ∆Go>0;Keq<1∆ {G}^{o} > 0; {K}_{eq} < 1

Step-by-step solution

ΔG∘=−2.303RTlogk{\Delta G}^{∘} = - 2 . 303RTlogk

ΔG∘=−nFEo{\Delta G}^{∘} = - {nFE}^{o}

∵Ecello=−ve(Ecello<0)∵ {E}_{cell}^{o} = - ve\left({E}_{cell}^{o} < 0\right), then,

ΔG∘=−nF(−Eo)=+ve{\Delta G}^{∘} = - nF\left(- {E}^{o}\right) = + ve

From the equation, ΔG∘=−2.303RTlogk{\Delta G}^{∘} = - 2 . 303RTlogk


∴∆G∘=+ve∴ ∆ {G}^{∘} = + ve & Keq=−ve{K}_{eq} = - ve

i.e., ∆G∘>0∆ {G}^{∘} > 0 & Keq<1{K}_{eq} < 1.

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