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SO2 acts as a bleaching agent. How?...

`SO_2` acts as a bleaching agent. How?

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In the presence of moisture, `SO_2` gives nascent hydrogen which reduces the colouring matter to a colourless compound.
`SO_2 + 2H_2 O rarr H_2SO_4 + 2H`
Vegetable colouring matter ` + H rarr ` Colouless matter
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KALYANI PUBLICATION-P-BLOCK ELEMENTS-EXERCISE (PART-II)(DESCRIPTIVE QUESTIONS)(VERY SHORT ANSWER QUESTIONS)
  1. Write one chemical equation to show that SO2 acts as a reducing agent...

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  2. What happens when SO2 reacts with CI2 : (i) in presence of sunlight....

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  3. SO2 acts as a bleaching agent. How?

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  4. Why dry SO2 does not bleach dry flowers ?

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  5. Why does SO2 exhibit bleaching action only in presence of water?

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  6. What happens when H2S reacts with SO2 ?

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  7. What happens when SO2 is passed through caustic soda solution ?

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  8. What is the bond angle in SO2 ?

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  9. State the name of anhydride of H2SO4.

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  10. Why sulfuric acid is described as king of chemicals ?

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  11. Why sulfuric acid is also known as oil of vitriol?

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  12. Why the process of manufacture of H2SO4 is named contact process ?

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  13. In the manufacture of sulfuric acid by the contact process, why great ...

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  14. In the contact process, vanadium pentoxide is considered a better cata...

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  15. Why in the contact process, heating of catalyst is stopped, the moment...

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  16. Why SO3 formed by the oxidation of SO2 , is not directly dissolved in ...

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  17. Sulfuric acid having concentration greater than 98.5% H2SO4 cannot be...

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  18. Why conc. H2SO4 is stored in air tight bottles ?

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  19. What happens when ferrous sulfide is treated with dil. H2SO4 ?

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  20. What is the action of conc. H2SO4 on sulfur?

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