Question
Acidified $KMnO _4$ is a very strong oxidising agent. Prove it.
✓
Answer
1. In the presence of dilute sulphuric acid, potassium permanganate acts as a very strong oxidising agent. Permanganate ion is converted into $\mathrm{Mn}^{2+}$ ion.
$
\mathrm{MnO}_4^{-}+8 \mathrm{H}^{+}+5 \mathrm{e}^{-} \rightarrow \mathrm{Mn}^{2+}+4 \mathrm{H}_2 \mathrm{O}
$
2. Permanganate oxidises ferrous salt to ferric salt.
$
2 \mathrm{MnO}_4^{-}+10 \mathrm{Fe}^{2+}+16 \mathrm{H}^{+} \rightarrow 2 \mathrm{Mn}^{2+}+10 \mathrm{Fe}^{3+}+8 \mathrm{H}^2 \mathrm{O}
$
$
\mathrm{MnO}_4^{-}+8 \mathrm{H}^{+}+5 \mathrm{e}^{-} \rightarrow \mathrm{Mn}^{2+}+4 \mathrm{H}_2 \mathrm{O}
$
2. Permanganate oxidises ferrous salt to ferric salt.
$
2 \mathrm{MnO}_4^{-}+10 \mathrm{Fe}^{2+}+16 \mathrm{H}^{+} \rightarrow 2 \mathrm{Mn}^{2+}+10 \mathrm{Fe}^{3+}+8 \mathrm{H}^2 \mathrm{O}
$
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