A solution contains Fe^ 2+ , Fe^ 3+ and I^- ions. This solution w… - Vidyadip

MCQ

A solution contains $Fe^{2+}, Fe^{3+}$ and $ I^-$ ions. This solution was treated with iodine at $35^oC.$ $E^o$ for $Fe^{3+} /Fe^{2+}$ is $+ 0.77\, V$ and $E^o$ for $I_2/2I^- = 0.536\, V.$ The favourable redox reaction is

A
$I_2$ will be reduced to $I^-$
B
there will be no redox reaction
✓
$I^-$ will be oxidised to $I_2$
D
$Fe^{2+}$ will be oxidised to $Fe^{3+}$

✓

Answer

Correct option: C.

$I^-$ will be oxidised to $I_2$

c
Greater the value of reduction potential, greater will be its tendency, to get reduced. Since the reduction potential value $\cdot$

If $\mathrm{Fe}^{3+} / \mathrm{Fe}^{2+}(=+0.77 \mathrm{V})$ is greater than that of $I_{2} / 2 \mathrm{I}^{-}(=0.536 \mathrm{V}),$ Fe $^{3+}$ will be reduced to $\mathrm{Fe}^{2+}$ and $I^-$ will be oxidised to $I_2$.

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