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Write two uses of Selenium metal....

Write two uses of Selenium metal.

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ASSAM ACADEMIC CENTRE-The p-Block Elements-Example
  1. Name the molecular geometry of XeOF4.

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  2. Write the structure of Pyrophosphoric acid, H4P2O7.

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  3. Write two uses of Selenium metal.

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

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

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

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

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

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

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

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

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

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

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

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  15. Give two examples of anomalous behaviour of fluorine?

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  16. Explain the bleaching action of Cl2.

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  17. Name two poisonous gases which can be prepared from chlorine gas.

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  18. Why does the reactivity of nitrogen differ from phosphorous?

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  19. Why does NH3 form hydrogen bond but PH3 does not?

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  20. Explain why NH3 is basic while BiH3 is only feebly basic.

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