Question

H2so3 and cl2 are bleaching agents. Their action is due to

Answer 1

Hey,

ts bleaching action requires moisture (similar to chlorine). ... SO2 + H2O −→ H2SO3 H2SO3 interacts with the colouring matter forming nascent hydrogen. Thenascenthydrogenbleachesthecolouredmatter. Chlorinebeingapowerfulbleaching agent destroys delicate materials such as ... SO2 in the air causes 452 Oxygen Family.

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Answer 2

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Chlorine bleaches by the process of oxidation. It needs moisture for its bleaching action.

Chlorine reacts with water to form hydrochloric and hypochlorous acids.

Cl₂ + H₂O ——→ HCl + HClO

Hypochlorous acid is unstable, and it easily dissociates to form nascent oxygen.

HClO ——→ HCl + [O]

Nascent oxygen is a more powerful oxidising agent. Its formation is responsible for the bleaching nature of chlorine in the presence of moisture.

Bleaching by sulphur dioxide is temporary as atmospheric oxygen re-oxidizes the bleached matter after some time. The bleaching action sulphur dioxide is due to its reducing action. The colour of pigment on exposure to SO2 gets reduced to a colourless compound.

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