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Explain the following giving suitable re...

Explain the following giving suitable reasons: In the manufacture of `H_2SO_4` by contact process:
For the production of concentrated sulphuric acid, `SO_3` is not directly dissolved in water. 

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Sulfur trioxide is not directly dissolved in water since it forms a dense sulfuric acid fog or mist with water. The mist consisting of sulfuric acid particles, steam and unreacted water and sulfur trioxide prevents the absorption of sulfur trioxide which passes along with the outgoing gases.
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ICSE-P-BLOCK ELEMENTS-EXERCISE (PART-II)(DESCRIPTIVE QUESTIONS)(VERY SHORT ANSWER QUESTIONS)
  1. Why vanadium pentoxide is considered as a better catalyst than platini...

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

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

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

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

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

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

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

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

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  10. Why there is not more than 1.1 parts of ozone per million parts of air...

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  11. What is an ozoniser ?

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  12. Name the conditions for obtaining better yield of O3 from O2.

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  13. How is pure ozone obtained from ozonised oxygen?

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  14. Why group 17 elements are called halogens?

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  15. Which one of the halogens is radioactive ?

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  16. Why do halogens exist as diatomic molecules ?

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  17. Arrange the given halogens in increasing order of boiling points.

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  18. Why is F2 most reactive among halogens ?

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  19. Why is covalent bonding of halogens always sigma bonding?

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  20. Why is I2 more soluble in KI than in water?

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