Question

In $N{O}_3^{-}$ ion, the number of bond pair and lone pair of electrons present on nitogen atom is:

• A. 2,2
• B. 3,1
• C. 1,3
• D. 4,0

Answer 1

The correct option is D 4,0

Nitrogen has zero lone pair and 4 bond pairs in $N{O}_3^{-}$.

In $N{O}_3^{-}$ ion,

Due to the presence of one negative charge, the number of valence electrons=5+1=6.
There are 2σ bonds, 1πbond, and 1 coordinate bond( in which both electrons come from the same atom). Nitrogen forms a coordinate bond with Oxygen as it cannot have 5 bonds. Although 2 electrons are shared in a coordinate bond, the number of bond pairs is taken to be 1.

The number of bond pairs (or shared pairs)=4.

The number of lone pairs =0.

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