A galvanic cell is made up 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 ?

0.1 M - H C l

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0.1 M - H_{2} {S O}_{4}

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0.1 M - {N H}_{4} O H

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0.01 M - H C O O H

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Solution

The correct option is A $0.1 M - {N H}_{4} O H$
For given concentration cell;
$E_{c e l l} = \frac{R T}{F} l o g \frac{[H^{+}]_{R H S}}{[H^{+}]_{L H S}}$
for max. emf $[H^{+}]_{L H S}$ should be min, and that is for $N H_{4} O H (a q)$

hence option (C) is correct.

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