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JEE Main 20248 AprilEvening Shift
Exam
JEE Main
Year
2024
Date
8 April
Shift
Evening Shift
Subject
Chemistry
Chapter
d and f Block Elements

JEE Main 2024 · 8 April · Evening Shift · Chemistry · d and f Block Elements

Given below are two statements : Statement (I) : Fusion of (MnO_2)...

Given below are two statements : Statement (I) : Fusion of (\mathrm{MnO}_2) with (\mathrm{KOH}) and an oxidising agent gives dark green (\mathrm{K}_2 \mathrm{MnO}_4). Statement (II) : Manganate ion on electrolytic oxidation in alkaline medium gives permanganate ion. In the light of the above statements, choose the correct answer from the options given below :

Options

  1. AStatement I is true but Statement II is false
  2. BBoth Statement I and Statement II are false
  3. CStatement I is false but Statement II is true
  4. DBoth Statement I and Statement II are true

Correct answer

D. Both Statement I and Statement II are true

Step-by-step solution

MnO2+4KOH+O2→ fused 2 K2MnO4+2H2\mathrm{MnO}_2+4 \mathrm{KOH}+\mathrm{O}_2 \xrightarrow{\text{ fused }} 2 \mathrm{~K}_2 \mathrm{MnO}_4+2 \mathrm{H}_2O\mathrm{O}DarkgreenElectrolyticoxidationinalkalinemedium:Atanode:Dark green Electrolytic oxidation in alkaline medium : At anode :MnO42−\mathrm{MnO}_4^{2-} \rightarrow MnO4−+\mathrm{MnO}_4^{-}+e−\mathrm{e}^{-}
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