First slide

Electronic configuration and Atomic , physical properties

Question

Incorrect statement is

Easy

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

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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