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Chemical Reactions and Equations — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceChemical Reactions and Equations1 Mark
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?
  1. KMnO4 is an oxidising agent, it oxidises FeSO4
  2. FeSO4 acts as an oxidising agent and oxidises KMnO4
  3. The colour disappears due to dilution, no reaction is involved
  4. KMnO4 is an unstable compound and decomposes in presence of FeSO4 to a colourless compound.
✓

Answer

  1. KMnO4 is an oxidising agent, it oxidises FeSO4

Explanation: Potassium permanganate (KMnO4) acts as good oxidizing agent in acidic medium and reduces itself to manganese captions, Mn2+. It oxidizes FeSO4 to Fe2(SO4)3

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