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Regarding bleaching action of sulphur dioxide, incorrect statement is

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The basic equation is $SO_2+2H_2O\rightarrow H_2SO_4+2(H)$

It bleaches by reduction

It undergoes oxidation

Bleaching is permanant

answer is D.

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Detailed Solution

$\mathop S\limits^{ + 4} {O_2} + 2{H_2}O \to {H_2}\mathop S\limits^{ + 6} {O_4} + 2(H)$

$coloured\;matter+2(H)\rightarrow colourless\;matter$

SO₂ bleaches by reduction where it undergoes oxidation

Bleaching by SO₂ is temporary because it bleaches by reduction

Substances bleached by SO₂ get immediately Oxidized in air

So bleaching by SO₂ is not permanent

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