Sulphur dioxide acts as bleaching agent in presence of moisture,it is due to liberation of:

nascent oxygen

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nascent hydrogen

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nascent sulphur

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none of these

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Solution

The correct option is D nascent hydrogen
Presence of moisture and ${S O}_{2}$ gives bleaching.
${S O}_{2} (g) + 2 H_{2} O ⟶ H_{2} {S O}_{4} (a q .) + 2 [H]$
$2 [H] +$ coloring matter $⟶$ colorless matter.
Bleaching by sulphur dioxide is temporary as atmospheric oxygen re-oxides the bleached matter after some time.

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When the gases sulphur dioxide and hydrogen sulphide mix in the presence of water the reaction is :

SO₂+2H₂S=2H₂O+3S

Here hydrogen sulphide is acting as :

A. Oxidizing agent

B. Reducing agent

S O_{2}

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