Question

A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?
A. `KMnO_(4)` is an oxidising agent and it oxidises `FeSO_(4)`
B. (b) `FeSO_(4)` acts as an oxidising agent and it oxidises `KMnO_(4)`
C. The colour disappears due to dilution , no reaction in involved
D. `KMnO_(4)` is an unstable compound and decomposes in presence of `FeSO_(4)` to a colourless compound.

Answer 1

Correct Answer - A
Potassium permanganate `(KMnO_(4))` is an oxidising agent. It oxidises ferrous sulphate to ferric sulphate in the presence of dilute `H_(2)SO_(4)`.
`underset("(Purple)")(2KMnO_(4)) + 8H_(2)SO_(4) + 10FeSO_(4) to K_(2)SO_(4) + 2MnSO_(4) + 8H_(2)O + 5Fe_(2)(SO_(4))_(3).`