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AIIMS 2014
Exam
AIIMS
Year
2014
Subject
Chemistry
Chapter
d and f Block Elements

AIIMS 2014 · Chemistry · d and f Block Elements

KMnO_4 in alkaline medium changes to

KMnO4\mathrm{KMnO}_4 in alkaline medium changes to

Options

  1. AMn3+\mathrm{Mn}^{3+}
  2. BMnO2\mathrm{MnO}_2
  3. CMnO42−\mathrm{MnO}_4^{2-}
  4. DMn⁡(OH)4−\operatorname{Mn}(\mathrm{OH})_4^{-}

Correct answer

B. MnO2\mathrm{MnO}_2

Step-by-step solution

In alkaline solution, KMnO4\mathrm{KMnO}_4 is first reduced to manganate and then to insoluble manganese dioxide. 2KMnO4+H2O⟶ alkaline 2MnO2+2KOH+3[O]\begin{aligned} & 2 \mathrm{KMnO}_4+\mathrm{H}_2 \mathrm{O} \stackrel{\text{ alkaline }}{\longrightarrow} 2 \mathrm{MnO}_2+2 \mathrm{KOH} \\ &+3[\mathrm{O}] \end{aligned}
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