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