NEET UG CHEMISTRY MCQ: ELECTRO CHEMISTRY

1 Hard

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Analyzing +4 | -1

A solution contains

\mathrm{Fe}^{2+}, \mathrm{Fe}^{3+}

and

\mathrm{I}^{-}

ions. This solution was treated with iodine at

35^{\circ} \mathrm{C}

\mathrm{E}^{\circ}

for

\mathrm{Fe}^{3+} / \mathrm{Fe}^{2+}

+0.77 \mathrm{~V}

and

\mathrm{E}^{\circ}

for

\mathrm{I}_2 / 2 \mathrm{I}^{-}=0.536 \mathrm{~V}

. The favourable redox reaction is

View answer and explanation

Correct option: A

\mathrm{I}^{-}

will be oxidised to

\mathrm{I}_2

Option C (

\mathrm{I}_2

will be reduced to

\mathrm{I}^{-}

) is correct because the E° for Fe3+/Fe2+ is greater than E° for I2/2I-, so Fe3+ will oxidize I- to I2, and iodine will be reduced to iodide.

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