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Application of Electrolysis

The standard ...

Question

The standard reduction potentials of $Ag, Cu, Co and Zn$ is $0.799 V, 0.337 V, - 0.277 V, - 0.762 V$ respectively. Which of the following cells will have maximum cell e.m.f. value?

A

Z n | Z n^{2 +} (1 M) | | C u^{2 +} (1 M) | C u

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B

Z n | Z n^{2 +} (1 M) | | A g^{+} (1 M) | A g

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C

C u | C u^{2 +} (1 M) | | A g^{+} (1 M) | A g

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D

Z n | Z n^{2 +} (1 M) | | C o^{2 +} (1 M) | C o

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Solution

The correct option is B $Z n | Z n^{2 +} (1 M) | | A g^{+} (1 M) | A g$
The maximum cell potential, when $A g$ ion is reduced and $Z n$ oxidized.
Hence, $Z n$ act as anode and $A g$ act as cathode.
$Z n | Z n^{2 +} (a q) | | A g^{+} (a q) | A g$
$E_{c e l l}^{o} = E_{A g^{+} | A g}^{o} - E_{Z n^{2 +} | Z n}^{o}$
$E_{c e l l}^{o} = 0.799 - (- 0.762) = 1.561 V$

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Similar questions

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