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Why vanadium pentoxide is considered as ...

Why vanadium pentoxide is considered as a better catalyst than platinised asbestos ?

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Vanadium pentoxide is considered a better catalyst than platinised asbestos because it is cheap and not easily poisoned by the impurities present in the gases.
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ICSE-P-BLOCK ELEMENTS-EXERCISE (PART-II)(DESCRIPTIVE QUESTIONS)(VERY SHORT ANSWER QUESTIONS)
  1. Why the process of manufacture of H2SO4 is named contact process ?

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

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

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

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

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

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

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

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

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

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

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

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  13. What is an ozoniser ?

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

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  15. How is pure ozone obtained from ozonised oxygen?

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  16. Why group 17 elements are called halogens?

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  17. Which one of the halogens is radioactive ?

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  18. Why do halogens exist as diatomic molecules ?

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

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  20. Why is F2 most reactive among halogens ?

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