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Sulphur dioxide acts as bleaching agent ...

Sulphur dioxide acts as bleaching agent in the presence of moisture. Discuss.

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In the presence of moisture, sulphur dioxide is oxidised to `H_(2)SO_(4)` liberating nascent hydrogen. The latter reduces coloured substances due to reduction.
`SO_(2)+2H_(2)O to H_(2)SO_(4) +2 [H]`
Coloured substance `+2 [H] to ` colourless (bleached)
However, the bleaching by sulphur dioxide is only temporatory. When the bleached article is exposed to air, it again gets coloured due to oxidation.
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DINESH PUBLICATION-THE P-BLOCK ELEMENTS -Concept Based Questions
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  3. Sulphur dioxide acts as bleaching agent in the presence of moisture. D...

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  4. Sulphur is a solid while oxygen is a gas at room temperature. Why ?

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  5. SF(6) is a well known compound while SH(6) does not exist. Explain.

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  6. Oxygen does not show oxidation states of +4 " and " +6 like sulphur. E...

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  7. H(2)O is liquid while H(2)S is a gas at room temperature. Explain.

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  8. Sulphur dioxide is a more powerful reducing agent in the alkaline medi...

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  9. Bond angle in H(2)S is lower than in H(2)O. Justify.

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  10. Hydrogen sulphide cannot be dried by passing through conc. H(2)SO(4) ....

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  11. H(2)S is a stronger acid than H(2)O. Explain

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  12. Sulphur vapours exhibit some paramagnetic behaviour. Explain.

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  13. SF(6) is not easily hydrolysed whereas SF(4) can be. Assign reason.

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  14. Bond dissociation enthalpy of F-F bond is less than that of Cl-Cl bond...

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  15. Sulphur disappears when boiled with aqueous solution of sodium sulphit...

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  16. Chlorine water has both oxidising as well as bleaching properties ? Ex...

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  17. Oxygen molecule has the formula O(2) while sulphur is S(8). Why ?

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  18. Why is H(2)S less acidic than H(2)Te ?

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  19. Why does burning Mg continue to burn in a jar containing NO but burnin...

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  20. Reducing character decreases from SO(2) " to " TeO(2). Explain.

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