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JIPMER 2017
Exam
JIPMER
Year
2017
Subject
Chemistry
Chapter
d and f Block Elements

JIPMER 2017 · Chemistry · d and f Block Elements

When I^ - is oxidised by MnO_4^ - in alkaline medium, I^ - converts...

When I−\mathrm{I}^{-}is oxidised by MnO4−\mathrm{MnO}_4^{-}in alkaline medium, I−\mathrm{I}^{-}converts into

Options

  1. AIO3−\mathrm{IO}_3^{-}
  2. BI2I_2
  3. CIO4−\mathrm{IO}_4^{-}
  4. DI0−I0^{-}

Correct answer

A. IO3−\mathrm{IO}_3^{-}

Step-by-step solution

When I−\mathrm{I}^{-}is oxidised by MnO4−\mathrm{MnO}_4^{-}in alkaline medium, I−\mathrm{I}^{-}converts into IO3−\mathrm{IO}_3^{-}. The reaction occurs as follows. 2KMnO4+2KOH⟶K2MnO4+H2O+[O]→2K2MnO4+2H2O⟶2MnO2+4KOH+2[O]2KMO4+H2O→ Alkaline 2MnO2+2KOH+3[O]KI+3[O]⟶KIO3\begin{gathered}2 \mathrm{KMnO}_4+2 \mathrm{KOH} \longrightarrow \mathrm{K}_2 \mathrm{MnO}_4+\mathrm{H}_2 \mathrm{O}+[\mathrm{O}] \\ \xrightarrow[2]{\mathrm{K}_2 \mathrm{MnO}_4+2 \mathrm{H}_2 \mathrm{O} \longrightarrow 2 \mathrm{MnO}_2+4 \mathrm{KOH}+2[\mathrm{O}]} \\ 2 \mathrm{KMO}_4+\mathrm{H}_2 \mathrm{O} \xrightarrow{\text{ Alkaline }} 2 \mathrm{MnO}_2+2 \mathrm{KOH}+3[O]\end{gathered} \mathrm{KI}+3[\mathrm{O}] \longrightarrow \mathrm{KIO}_3 i.e. IO3−\mathrm{IO}_3^{-}-ion
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