Answer :

(i) The preparation of potassium permanganate can be done by taking 5g of KMnO4 In 100ml solution. This is weight/volume (strength) calculation.

(ii) Alkaline potassium permanganate is an oxidizing agent due to nascent oxygen which adds oxygen or removes hydrogen and thus oxidizes ethanol to ethanoic acid. Adding alkaline permanganate to ethanol, the pink colour of potassium permanganate vanishes, as it is being used up for the oxidation process.


(iii) Potassium permanganate react with ethanol as:


2KMnO4 + 3C2H5OH 2MnO2 + 3CH3CHO + 2KOH + 2H2O


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