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a
Nitrogen can not show a valency of five
b
Nitrogen can not show '+5' Ox. state
c
Bismuth can  show +5 ox. state
d
Bismuth  shows a stable '+3' state

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detailed solution

Correct option is B

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: NCl5 can not existBut 'N' can show an oxidation state of '+5'  Ex: N2O5.

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