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JAMB Chemistry 2016 Paper

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Question : 41

Total: 50

MnO

_4

^{2+}

↦

^{2+}

^{3+}

_2

O (l).

10H⁺ _(aq)
5H⁺ _(aq)
8H⁺ _(aq)
4H⁺ _(aq)

Solution:

Concept:

Balancing the redox reaction of permanganate ion in acidic medium.

Explanation:

Permanganate is reduced in acidic solution:

\mathrm{MnO_4^- + 8H^+ + 5e^- \rightarrow Mn^{2+} + 4H_2O}

Iron(II) is oxidised:

5\mathrm{Fe^{2+} \rightarrow 5Fe^{3+} + 5e^-}

Adding the two half-reactions:

\mathrm{MnO_4^- + 8H^+ + 5Fe^{2+} \rightarrow Mn^{2+} + 5Fe^{3+} + 4H_2O}

Therefore, Y is

8\mathrm{H^+}_{(aq)}

.

Answer:

C.

8\mathrm{H^+}_{(aq)}

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