A cell with two electrodes, one of grey tin and the other white tin, both dipping in solution of ${\left( {{\rm{N}}{{\rm{H}}_4}} \right)_2}{\rm{SnC}}{{\rm{l}}_6}$ showed zero e.m.f. at ${18^ \circ }C$. What conclusion may be drawn from this?

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

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

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

NEET UG CHEMISTRY MCQ: ELECTRO CHEMISTRY

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Understanding +4 | -1

A cell with two electrodes, one of grey tin and the other white tin, both dipping in solution of

{\left( {\mathrm{N}{\mathrm{H}_4}} \right)_2}\mathrm{SnC}{\mathrm{l}_6}

showed zero e.m.f. at

{18^ \circ }C

. What conclusion may be drawn from this?

View answer and explanation

Correct option: D

The standard Gibbs energy change of the cell becomes zero

Option D is correct because at zero e.m.f., the standard Gibbs energy change, which is directly related to the cell potential, must also be zero.