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JAMB Chemistry 2011 Paper

Question : 26

Total: 47

In the equation above, Y is

Solution:

Concept:

Balancing the redox equation in acidic medium using hydrogen ions.

Explanation:

The permanganate ion,

\mathrm{MnO}_4^-

, is reduced to

\mathrm{Mn}^{2+}

, while

\mathrm{Fe}^{2+}

is oxidised to

\mathrm{Fe}^{3+}

There are 4 oxygen atoms on the left, which form

4\mathrm{H}_2\mathrm{O}

on the right.

Therefore, 8 hydrogen atoms must be supplied on the left as

8\mathrm{H}^+

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

Answer:

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

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