Which of the following transformations can be | vedclass

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(C) For a reaction to be spontaneous,the cell potential $E^{\circ}_{cell}$ must be positive.The reaction involves the oxidation of $I^-$ to $I_2$ $(E^

Vedclass · Accepted Answer

Only $iii$

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(C) For a reaction to be spontaneous,the cell potential $E^{\circ}_{cell}$ must be positive.The reaction involves the oxidation of $I^-$ to $I_2$ $(E^{\circ}_{ox} = -0.54 \ V)$ and the reduction of the metal ion $(E^{\circ}_{red})$.The condition for spontaneity is $E^{\circ}_{cell} = E^{\circ}_{red} + E^{\circ}_{ox} > 0$,which implies $E^{\circ}_{red} > 0.54 \ V$.Comparing the given reduction potentials:$(i)$ $E^{\circ} = 0.52 \ V $(ii)$ $E^{\circ} = -0.41 \ V $(iii)$ $E^{\circ} = 0.77 \ V > 0.54 \ V$ (Spontaneous)$(iv)$ $E^{\circ} = -0.44 \ V Therefore,only the transformation $(iii)$ is feasible.

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