Ncert Exercises & Solutions

In the titration of KMnO₄ or its use as an oxidizing agent, the medium is acidified with dilute H₂SO₄ rather than HCl because:

1.	Both HCl and KMnO₄ act as oxidising agents
2.	KMnO₄ oxidises HCl into Cl₂, which is also an oxidising agent
3.	KMnO₄ is a weaker oxidising agent than HCl
4.	KMnO₄ acts as a reducing agent in the presence of HCl

Hint: \(2 \mathrm{MnO}_4^{-}+16 \mathrm{H}^{+}+10 \mathrm{Cl}^{-} \rightarrow 2 \mathrm{Mn}^{2+}+5 \mathrm{Cl}_2+8 \mathrm{H}_2 \mathrm{O}\)
HCl is not used to make the medium acidic in oxidation reactions of

K M n O_{4}

in acidic medium. The reason is that if HCl is used, the oxygen produced from

K M n O_{4}

+ HCl is partly utilised in oxidising HCI to Cl₂ , which itself acts as an oxidising agent and partly oxidises the reducing agent.

NEET Information

courses

Company

Botany Questions

Chemistry Questions

Physics Questions

Zoology Questions