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A solution contains \( \mathrm{Fe}^{2+}, \mathrm{Fe}^{3+} \) and \( \mathrm{I}^{-} \)ions.
\( \mathrm{P} \) This solution was treated with iodine at \( 35^{\circ} \mathrm{C} \).

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\( \mathrm{E}^{\circ} \) for \( \mathrm{Fe}^{3+} \mathrm{I} \mathrm{Fe}^{2+} \) is \( +0.77 \mathrm{~V} \) and \( \mathrm{E}^{\circ} \) for
\( \mathrm{I}_{2} / 2 \mathrm{I}^{-}=0.536 \mathrm{~V} \). The favourable redox
reaction is :-
(1) \( \mathrm{Fe}^{2+} \) will be oxidised to \( \mathrm{Fe}^{3+} \)
(2) \( \mathrm{I}_{2} \) will be reduced to \( \mathrm{I}^{-} \)
(3) There will be no redox reaction
(4) \( \mathrm{I}^{-} \)will be oxidised to \( \mathrm{I}_{2} \)
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