How many of the following can be oxidised by $KMnO_{4}$ ?
$I^{-}, C_{2} O_{4}^{- 2}, H_{2} S, S O_{4}^{2 -}, N O_{3}^{- 1}, B r^{- 1}, S O_{2}$

Question

How many of the following can be oxidised by KMnO 4 ​ ? I − , C 2 ​ O 4 − 2 ​ , H 2 ​ S , S O 4 2 − ​ , N O 3 − 1 ​ , B r − 1 , S O 2 ​

TestHub · Accepted Answer

KMnO₄ is a strong oxidizing agent, so it oxidizes species that can further increase their oxidation number.

Oxidized species are:

* I⁻ → I₂

* C₂O₄²⁻ → CO₂

* H₂S → S/SO₄²⁻

* Br⁻ → Br₂

* SO₂ → SO₄²⁻

But SO₄²⁻ and NO₃⁻ are already in their highest oxidation states, so they are not oxidized further.

Hence, the total number oxidized by KMnO₄ = 5.

Chemistry - Complete d-block Question with Solution | TestHub