How do you count for the following observations? a. Though alkaline potassium permanganate and acidic potassium permanganate both are used as oxidants, yet in themanufacture of benzoic acid from toluence we use alcoholic potassium permanganate as an oxidant. Why? Write a balanced redoxequation for the reaction. b. When concentrated sulphuric acidadded to an inorganic mixture containing chloride, we get colourlesspungent smelling gas HCl, but if the mixture contains bromide then we get red vapour og bromine. why?

How do you count for the following observations? a. Though alkaline p

1.	How do you count for the following observations? a. Though alkaline potassium permanganate and acidic potassium permanganate both are used as oxidants, yet in themanufacture of benzoic acid from toluence we use alcoholic potassium permanganate as an oxidant. Why? Write a balanced redoxequation for the reaction. b. When concentrated sulphuric acidadded to an inorganic mixture containing chloride, we get colourlesspungent smelling gas HCl, but if the mixture contains bromide then we get red vapour og bromine. why?
Answer» SOLUTION :When conc `H_(2)SO_(4)` is ADDED to an inorgainc mixture CONTAINING chloride, a pungent smelling gas `HCl` is produced because a stronger ACID displaces a weaker acid from its sail. `2NaCl+2H_(2)SO_(4) rarr 2NaHSO_(4)+2HCl` Since HCl is a very weak reducing agent, it can not reduce `H_(2)SO_(4)` to `SO_(2)`, and hence `HCl` is not oxidised to `Cl_(2)`. However, when the mixture contains bromide ion, the inially produced `HBr` being a stronger reducing agent reduces `H_(2)SO_(4)` to `SO_(2)` and is itself oxidised to produce red vapour of `Br_(2)`. `2NaBr+2H_(2)SO_(4) rarr 2NaHSO_(4)+2HBr` `2HBr+H_(2)SO_(4)rarr Br_(2)+SO_(2)+2H_(2)O`