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What is the importance of ozone for plan...

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

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Ozone layer around earth (ozone blanket) protects the plants and animals from the harmful effects of the ultraviolet radiations of the sun.
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ICSE-P-BLOCK ELEMENTS-EXERCISE (PART-II)(DESCRIPTIVE QUESTIONS)(VERY SHORT ANSWER QUESTIONS)
  1. What is the action of conc. H2SO4 on sulfur?

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

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

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

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  5. What is an ozoniser ?

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

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  7. How is pure ozone obtained from ozonised oxygen?

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  8. Why group 17 elements are called halogens?

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  9. Which one of the halogens is radioactive ?

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  10. Why do halogens exist as diatomic molecules ?

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

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  12. Why is F2 most reactive among halogens ?

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

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

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  15. Among the halogen hydrides, which has maximum per cent of ionic charac...

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  16. Arrange the haloacids in the increasing order of acid strength.

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  17. Why HI cannot be obtained by heating KI with conc. H2SO4 ?

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  18. Which of the hydracids of halogens reacts with glass?

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  19. Iodine forms I3^(-) but F2 does not form F(3)^(-) ions. Why?

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  20. CIF3 exists but FCl3 does not exist. Why?

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