First slide

Standard EMF of a cell

Question

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

Moderate

A

E₁ > E₂ > E₃
B

E₃ > E₂ > E₁
C

E₃ > E₁ > E₂
D

E₂ > E₁ > E₃

Solution

According Nernstequation
When cell contains both metal electrodes
$SRP \propto {\left[ {{M^{ + n}}} \right]^x}$
;
$\left[ {{M^{ + n}}} \right]increases\,\,\,SRP\,\,\,\,increases$
$SOP\alpha \frac{1}{[M^{+n}]^{x}}$
;
$\,\left[ {{M^{ + n}}} \right]decreases\,\,\,SOP\,\,\,\,increases$

in cell II SOP is increasing and in cell III SRP is decreasing.
order is E₂ > E₁ > E₃

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