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Nitrogen can not show a valency of five

Nitrogen can not show '+5' Ox. state

Bismuth can show +5 ox. state

Bismuth shows a stable '+3' state

answer is B.

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Detailed Solution

Ox. state is an assumed charge on atom using orbitrary rules. It is not a real concept.

Valency is a real concept which indicates the no. of electrons involved in the reaction.

Nitrogen due to non-availability of d-orbitals can not show penta valency Ex: NCl₅can not exist

But 'N' can show an oxidation state of '+5' Ex: N₂O₅.

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