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The emf of the following three galvanic cells are represented by E₁, E₂ and E₃ respectively. Which of the following is correct ?
(i) Zn/Zn²⁺(1M)//Cu²⁺(1M)/Cu
(ii) Zn/Zn²⁺(0.1M)//Cu²⁺(1M)/Cu
(iii) Zn/Zn²⁺(1M)//Cu²⁺(0.1M)/Cu

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E₁ > E₂ > E₃

E₃ > E₂ > E₁

E₃ > E₁ > E₂

E₂ > E₁ > E₃

answer is D.

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Detailed Solution

According Nernstequation

When cell contains both metal electrodes

SRP \propto {\left[ {{M^{ + n}}} \right]^x}

;

\left[ {{M^{ + n}}} \right]increases\,\,\,SRP\,\,\,\,increases

;

\,\left[ {{M^{ + n}}} \right]decreases\,\,\,SOP\,\,\,\,increases

in cell II SOP is increasing and in cell III SRP is decreasing.

order is E₂ > E₁ > E₃

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