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Home » How do you count for the following observations? (a) Though alkaline potassium permanganate and acidic potassium permanganate both are used as oxidants, yet in the manufacture of benzoic acid from toluene we use alcoholic potassium permanganate as an oxidant. Why? Write a balanced redox equation for the reaction. (b) When concentrated sulphuric acid is added to an inorganic mixture containing chloride, we get colourless pungent smelling gas HCl, but if the mixture contains bromide then we get red vapour of bromine. Why?
How do you count for the following observations? (a) Though alkaline potassium permanganate and acidic potassium permanganate both are used as oxidants, yet in the manufacture of benzoic acid from toluene we use alcoholic potassium permanganate as an oxidant. Why? Write a balanced redox equation for the reaction. (b) When concentrated sulphuric acid is added to an inorganic mixture containing chloride, we get colourless pungent smelling gas HCl, but if the mixture contains bromide then we get red vapour of bromine. Why?
CBSE | Chemistry | Class 11 | Exercise 1 | NCERT | Redox Reactions
How do you count for the following observations? (a) Though alkaline potassium permanganate and acidic potassium permanganate both are used as oxidants, yet in the manufacture of benzoic acid from toluene we use alcoholic potassium permanganate as an oxidant. Why? Write a balanced redox equation for the reaction. (b) When concentrated sulphuric acid is added to an inorganic mixture containing chloride, we get colourless pungent smelling gas HCl, but if the mixture contains bromide then we get red vapour of bromine. Why?

Solution:

(a) While producing benzoic corrosive from toluene, alcoholic potassium permanganate is utilized as an oxidant because of the given reasons.

(I) In an impartial medium, O H^{-}ions are created in the response. Because of that, the expense of adding a corrosive or a base can be diminished.

(ii) K M n O_{4} and liquor are homogeneous to one another as they are polar. Liquor and toluene are homogeneous to one another in light of the fact that both are natural mixtures. Responses can continue at a quicker rate in a homogeneous medium contrasted with heterogeneous medium. Consequently, in liquor, \mathrm{KMnO}_{4} and toluene can respond at a quicker rate

The redox response is as given beneath:

(b) When concentrated H_{2} S O_{4} is added to an inorganic combination containing bromide, right off the bat \mathrm{HBr} is created.

HBr, a solid lessening specialist, diminishes \mathrm{H}_{2} \mathrm{SO}_{4} to \mathrm{SO}_{2} with the development of bromine’s red fume.

2 \mathrm{NaBr}+2 \mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow 2 \mathrm{NaHSO}_{4}+2 \mathrm{HBr}

2 \mathrm{HBr}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{Br}_{2}+\mathrm{SO}_{2}+2 \mathrm{H}_{2} \mathrm{O}

When concentrated \mathrm{H}_{2} \mathrm{SO}_{4} । added to an inorganic combination containing chloride, a sharp smelling gas (HCl) is advanced. \mathrm{HCl}, a frail decreasing specialist, can’t diminish \mathrm{H}_{2} \mathrm{SO}_{4} to \mathrm{SO}_{2}.

2 \mathrm{NaCl}+2 \mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow 2 \mathrm{NaHSO}_{4}+2 \mathrm{HCl}

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