Question

Give chemical reactions for the following observations:

(i) Potassium permanganate is a good oxidising agent in basic

medium.

(ii) Inter convertibility of chromate ion and dichromate ion in aqueous

solution depends Upon pH of the solution.

(iii) Potassium permanganate is thermally unstable at 513K.

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Answer 1

2 MnO2 + 4 KOH + O2 → 2 K2MnO4 + 2 H2O2 MnO42– + Cl2 → 2 MnO4– + 2 Cl–

 

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Answer 2

Hey !!

(i) MnO₄⁻ + 2H₂O + 3e⁻ -----> MnO₂ + 4OH⁻ ] × 2

                I⁻  + 6OH⁻ ------> IO⁻₃ + 3H₂O + 6e⁻

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_2MnO₄⁻ + I⁻ + H₂O -------> IO₃⁻ + 2MnO₂ + 2OH⁻

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(ii) 2CrO₄²⁻ + 2H⁺ ⇄(Acid (pH less than 7) Cr₂O₇²⁻ + H₂O

(iii) 2KMnO₄ --(513K)--> K₂MnO₄ + MnO₂ + O₂

Good luck !!