A cell with two electrodes, one of grey tin and the other white tin, both dipped in solution of $(N H_{4})_{2} S n C l_{6}$ showed zero e.m.f. at 18 $^{o}$ C. What conclusion may be drawn from this?

The e.m.f. developed at the electrode-solution phase boundary cancels the normal e.m.f.

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Grey tin being non-metallic ceases to provide a reversible electrode reaction

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Electrode surface develops a protective layer and the cell develops a very large internal resistance

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The Gibbs energy change of the cell becomes zero

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Solution

The correct option is D The Gibbs energy change of the cell becomes zero
Since, EMF at equilibrium is zero i.e. $E^{o} = 0$ , we have $Δ G^{o} = - n E^{o} F = 0$ . So Gibbs free energy change of the cell is zero.

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