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Which is stronger oxidising agent: S₂O₈²⁻ or KMnO₄ ? and why : #NoSpamming

Answer»

that In KMnO₄ the Mn charge = +7,On writing the reaction in acidic , neutral and basic medium.(i)So reaction occurs in acidic medium :-_______________________MnO₄⁻ + 8 H⁺ + 5 e⁻ ----→ Mn²⁺ + 4H₂O_______________________As you see here , Mn gives up 5 e⁻ . (Making this as a strong oxidizing AGENT)(ii) So reaction occurs in Neutral medium :-_____________________MnO₄⁻ + 4H⁺ + 3 e⁻ ------→ MnO₂ + 2H₂O_____________________As you can see here , In this neutral solution, it gives up 3 e⁻ in FORMATION of MnO₂ & also some OH ions.(ii) So reaction occurs in Basic medium :-_____________________MnO₄⁻ + e⁻ -----→ MnO₄²⁻_____________________As you can see here, it only gives up 1 e⁻ , So it makes it WEAKER oxidizing agent.Hence we can simply observe here :-MnO₄⁻ ion → Acidic solution > Neutral solution > Basic solution.Hence it is strong oxidising agent in acidic medium.Hope it Helps :-)



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