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Why are elements of 16 group called Chal...

Why are elements of 16 group called Chalcogen?

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R G PUBLICATION-THE p-BLOCK ELEMENTS-EXERCISE
  1. Ammonia is a good complexing agent. Why?

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  2. SF6 is used as a gaseous electrical isulator, explain.

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  3. Why are elements of 16 group called Chalcogen?

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  4. Concentrated nitric acid turns yellow on exposure to sunlight, why?

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  5. CIF3 exists but FCI3 does not why?

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  6. Answer the following: why is helium-oxygen mixture preferred over air ...

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  7. Give one use of CIF3

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  8. Why the N-O bond in NO2^- is short or than the N-O bond in NO3^-?

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  9. Both O2 and F2 stabilize high oxidation states but the ability of oxyg...

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  10. What will happen when: Water solution of phosphine is exposed to light...

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  11. What will happen when: Alumina reacts with aquous solution of sodium h...

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  12. What will happen when: Aque regia reacts with platinum?

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  13. "Though size increases rapidly from N to P of group 15th elements but ...

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  14. Why does R3P=0 exist but R3N=0 does not?

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  15. Disuss the acidic characters of oxides of ni-togen and phoshorus.

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  16. How pure N2 gas is prepared in laboratory? Write the necessary equatio...

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  17. Discuss the optimum conditions for the manu-facture of ammonia.

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  18. How ammonia helps in the detection of metal ions is solution?

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  19. What will happen when lead nitrate is strongly heated? Write the neces...

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  20. How nitric acid is prepared by Ostwald method? Write the necessary rea...

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