Qstnid -Ii-16- Describe The Preparation Of Potassium Permanganate. How Does The Acidified Permanganate Solution React With () Iron(ii) Ions () So<sub>2</sub> And () Oxalic Acid? Write The Ionic Equations For The Reactions. - 08: The D-and F-block Elements - Neet-xii-chemistry

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NEET-XII-Chemistry

08: The d-and f-Block Elements

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#16
Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with () iron(II) ions () SO₂ and () oxalic acid?

Write the ionic equations for the reactions.

Ans : Potassium permanganate can be prepared from pyrolusite (MnO₂). The ore is fused with KOH in the presence of either atmospheric oxygen or an oxidising agent, such as KNO₃ or KClO₄, to give K₂MnO₄.

The green mass can be extracted with water and then oxidized either electrolytically or by passing chlorine/ozone into the solution.

Electrolytic oxidation

At anode, manganate ions are oxidized to permanganate ions.

Oxidation by chlorine

Oxidation by ozone

() Acidified KMnO₄ solution oxidizes Fe (II) ions to Fe (III) ions i.e., ferrous ions to ferric ions.

() Acidified potassium permanganate oxidizes SO₂to sulphuric acid.

() Acidified potassium permanganate oxidizes oxalic acid to carbon dioxide.

#16-i
iron(II) ions
Ans : Acidified KMnO₄ solution oxidizes Fe (II) ions to Fe (III) ions i.e., ferrous ions to ferric ions.

#16-ii
SO₂ and
Ans : Acidified potassium permanganate oxidizes SO₂to sulphuric acid.

#16-iii
oxalic acid?

Write the ionic equations for the reactions.

Ans : Acidified potassium permanganate oxidizes oxalic acid to carbon dioxide.