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  • 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 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, it oxidises FeSO_{4}

(b)FeSO_{4} acts as an oxidising agent and oxidises KMnO_{4}

(c) The colour disappears due to dilution; no reaction is involved

(d) KMnO_{4} is an unstable compound and decomposes in presence of FeSO_{4} to a colourless compound.

Answers (1)

Ans. (a)

FeSO_4 +KMnO_{4}+H_{2}SO_{4}\rightarrow Fe_{2}(SO_{4})_{3}+MnSO_4+K_{2}SO_{4}+H_{2}O

KMnO_{4} acts as an oxidizing agent, it oxidizes FeSO_4 (Fe^{+2}) to Fe_{2}(SO_{4})_{3} (Fe^{+3})

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