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Why are elements of 16 group called Chal...

Why are elements of 16 group called Chalcogen?

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ASSAM ACADEMIC CENTRE-The p-Block Elements-Example
  1. SF6 is used as a gaseous electrical insulator. Explain.

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  2. H2S is less acidic than H2Te.Why?

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  3. Why are elements of 16 group called Chalcogen?

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  4. Why NO become brown when exposed in air?

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  5. Why does PCl3 fume in moisture?

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  6. Name the molecular geometry of XeOF4.

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  7. Write the structure of Pyrophosphoric acid, H4P2O7.

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  8. Write two uses of Selenium metal.

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  9. Why is bond angle of PH3 molecule lesser than in NH3 molecule?

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  10. Why is white phosphorous more reactive than red phosphorous?

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  11. Which one has higher electron gain enthalpy with negative sign, sulphu...

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  12. How will you account for the following: NF3 is an exothermic compound ...

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  13. How will you account for the following: Among the hydrides of group 16...

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  14. How will you account for the following: Bleaching of flowers by chlori...

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  15. How will you account for the following: NCl3 is readily hydrolysed whi...

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  16. H2S acts only as reducing agent while SO2 acts as an oxidising as well...

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  17. Fluorine exhibits only+1 oxidation state, whereas other halogens also ...

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  18. Arrange HClO4, HClO3, HCIO2 and HClO in increasing orders of their Aci...

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  19. Bond angle in PH4^+ is higher than that is PH3.

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  20. Give two examples of anomalous behaviour of fluorine?

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