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PF(5) is known but NF(5) is not known. D...

`PF_(5)` is known but `NF_(5)` is not known. Discuss.

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Nitrogen does not have any `2d` orbitals in its valence shell. Therefore, it cannot extend its covalency upto five. But in case of phosphorus, vacant `3d` orbitals are present. An electron can be promoted from `3s` to `3d` orbital. As a result, phosphorus can extend its covalency upto five and a molecule of `PF_(5)` can exist.
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(a) PF_5 is known, but NF_5 is not. Why ? (b) The experimentally determined N-F bond length in NF_3 is greater than the sum of single convalent radii of N and F .

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    B
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    • DINESH PUBLICATION-THE P-BLOCK ELEMENTS -Concept Based Questions
    1. PF(5) is known but NF(5) is not known. Discuss.

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    2. Molecular nitrogen is very inert chemically. Why ?

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    3. The experimentally determined N-F bond length in NF(3) is greater than...

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    4. NF(3) is not hydrolysed while NCl(3) can be readily hydrolysed. Explai...

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    5. Nitrogen and chlorine have same electronegativity (3.0). Molecular nit...

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    6. H(3)PO(3) is a diprotic acid. Justify.

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    7. NF(3) " and " NH(3) are both pyramidal but differ widely in dipole mom...

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    8. All bonds in the molecule of PCl(5) are not equivalent. Explain.

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    9. PCl(5) acts as a chlorinating agent in organic reactions. Why ?

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    10. Boiling point of phosphine is less than that of ammonia though its mol...

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    11. On heating, (NH(3))(2)Cr(2)O(7) gives rise to a gas which on treatment...

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    12. Phosphorus acid can act both as oxidising agent as well as reducing ag...

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    13. Ammonia has a higher proton affinity than phosphine. Discuss.

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    14. Oxides of phosphorus have cage like and not open structures. Explain.

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    15. Ammonia acts as a ligand. Discuss.

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    16. Why does nitric oxide become brown when released in air ?

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    17. There is a small increase in atomic radius in moving from P to As in g...

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    18. H(3)PO(2) and H(3)PO(3) act as good reducing agents while H(3)PO(4) do...

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    19. Give reasons for the following : (a) CN^(-) ion is known but CP^(-) ...

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    20. Explain why both N and Bi do not form pentahalides while phosphorus do...

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