Pentavalency is shown by phosphorous but not by nitrogen. This is due to:
[1 Mark]

Dissimilar electronic configuration

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Due to presence of vacant d-orbitals in phosphorous

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Reactive nature of phodphorus

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Intert nature of nitrogen

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Solution

The correct option is B Due to presence of vacant d-orbitals in phosphorous
Phosphorous can achieve coordination number $5$ due to vacant d atomic orbitals in valence shell which is not possible in nitrogen.

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Though nitrogen and phosphorous exhibits +5 oxidation state, nitrogen does not form pentahalide but phosphorous forms. Give reason.

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