The hybridisations of the atomic orbitals of nitrogen in , and respectively are:

Question

The hybridisations of the atomic orbitals of nitrogen in ,  and  respectively are:

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Step 1 — Count electron pairs on N in each species:

(nitrite ion):
- N has 2 bonds + 1 lone pair = 3 electron pairs → sp² hybridization

(nitronium ion):
- N has 2 double bonds + 0 lone pairs = 2 electron pairs → sp hybridization
- Linear shape

(ammonium ion):
- N has 4 bonds + 0 lone pairs = 4 electron pairs → sp³ hybridization

Step 2 — Matching: sp², sp, sp³

Answer: Option (4) — sp², sp and sp³

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