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Why heating of catalyst is discontinued ...

Why heating of catalyst is discontinued the moment the oxidation of sulphur dioxide takes place ?

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Catalyst is initially heated to 723 K and the heating is stopped, the moment oxidation of sulfur dioxide takes place. It is because the oxidation of `SO_2` to `SO_3` is an exothermic reaction and the heat produced during the reaction maintains the temperature at 723-773 K.
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ICSE-P-BLOCK ELEMENTS-EXERCISE (PART-II)(DESCRIPTIVE QUESTIONS)(VERY SHORT ANSWER QUESTIONS)
  1. In the the manufacture of sulphuric acid by the Contact process ,give ...

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

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

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

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

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

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

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

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

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

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

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  12. What is an ozoniser ?

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

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  14. How is pure ozone obtained from ozonised oxygen?

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  15. Why group 17 elements are called halogens?

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  16. Which one of the halogens is radioactive ?

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  17. Why do halogens exist as diatomic molecules ?

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

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  19. Why is F2 most reactive among halogens ?

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

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