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Why does SO2 exhibit bleaching action o...

Why does `SO_2` exhibit bleaching action only in presence of water?

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`SO_2` bleaches by reduction. In absence of moisture, nascent hydrogen required for bleaching is not produced.
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ICSE-P-BLOCK ELEMENTS-EXERCISE (PART-II)(DESCRIPTIVE QUESTIONS)(VERY SHORT ANSWER QUESTIONS)
  1. SO2 acts as a bleaching agent. How?

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  2. Dry SO(2) does not bleach dry flowers because

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

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  4. What happens when H2S reacts with SO2 ?

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

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  6. What is the bond angle in SO2 ?

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  7. State the name of anhydride of H2SO4.

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

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

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

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  11. In the the manufacture of sulphuric acid by the Contact process ,give ...

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  12. Why vanadium pentoxide is considered as a better catalyst than platini...

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  13. Why heating of catalyst is discontinued the moment the oxidation of su...

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  14. Explain the following giving suitable reasons: In the manufacture of H...

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

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

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

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

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  19. Which gas is produced when common salt reacts with conc. H2 SO4 ?

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  20. What is the importance of ozone for plant and animal life on earth?

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