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Q.

A galvanic cell is composed of two hydrogen electrodes, one of which is a standard one. In which of the following solutions should the other electrode be immersed to get maximum emf

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a

$0.1 M H_{2} S O_{4}$

b

$0.1 M H C l$

c

$0.1 M N H_{4} O H$

d

$0.1 M H C O O H$

answer is C.

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Detailed Solution

For given concentration cell

$E_{cell} = \frac{RT}{F} \log \frac{{[H^{+}]}_{RHS}}{{[H^{+}]}_{LHS}}$

for max. emf ${[H^{+}]}_{LHS}$ should be min. and that is for ${NH}_{4} OH (aq)$

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A galvanic cell is composed of two hydrogen electrodes, one of which is a standard one. In which of the following solutions should the other electrode be immersed to get maximum emf