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JEE Advanced 2011Paper 2
Exam
JEE Advanced
Year
2011
Paper
Paper 2
Subject
Chemistry
Chapter
d and f Block Elements

JEE Advanced 2011 · Paper 2 · Chemistry · d and f Block Elements

Reduction of the metal centre in aqueous permanganate ion involves

Reduction of the metal centre in aqueous permanganate ion involves

Options

  1. Athree electrons in neutral medium
  2. Bfive electrons in neutral medium
  3. Cthree electrons in alkaline medium
  4. Dfive electrons in acidic medium

Correct answer

A. three electrons in neutral medium

Step-by-step solution

In neutral medium: MnO4−→MnO2(Mn7++3e−→Mn4+)\quad \mathrm{MnO}_4^{-} \rightarrow \mathrm{MnO}_2\left(\mathrm{Mn}^{7+}+3 e^{-} \rightarrow \mathrm{Mn}^{4+}\right) In alkaline medium : MnO4−→MnO2(Mn7++3ε−→Mn4+)\quad \mathrm{MnO}_4^{-} \rightarrow \mathrm{MnO}_2\left(\mathrm{Mn}^{7+}+3 \varepsilon^{-} \rightarrow \mathrm{Mn}^{4+}\right) In acidic medium : $\quad \mathrm{Mn}_4^{-} \rightarrow \mathrm{Mn}^{2+}\left(\mathrm{Mn}^{7+}+5 e^{-} \rightarrow \mathrm{Mn}^{2+}\right)
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