Transition and InnerTransition Elements - Result Question 45
45. Reduction of the metal centre in aqueous permanganate ion involves
(2011)
(a) three electrons in neutral medium
(b) five electrons in neutral medium
(c) three electrons in alkaline medium
(d) five electrons in acidic medium
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Answer:
Correct Answer: 45. (a, c, d)
Solution: In neutral medium
$$ \mathrm{MnO}_4^{-} \rightarrow \mathrm{MnO}_2\left(\mathrm{Mn}^{7+}+3 e^{-} \rightarrow \mathrm{Mn}^{4+}\right) $$
In alkaline medium
$$ \mathrm{MnO}_4^{-} \rightarrow \mathrm{MnO}_2\left(\mathrm{Mn}^{7+}+3 e^{-} \rightarrow \mathrm{Mn}^{4+}\right) $$
In acidic medium
$$ \mathrm{MnO}_4^{-} \rightarrow \mathrm{Mn}^{2+}\left(\mathrm{Mn}^{7+}+5 e^{-} \rightarrow \mathrm{Mn}^{2+}\right) $$
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