The correct order of increasing bond angles in the following triatomic species is

Step-by-step solution

Key Idea : As the number of lone pair of electrons increases, bond angle decreases. NO ₂⁺ ion is isoelectronic with CO ₂ molecule. It is a linear ion and its central atom ( N ⁺ ) undergoes s p -hybridisation, hence bond angle is 180^ . In NO ₂⁻ ion, N -atom undergoes s p^2 hybridisation. The angle between hybrid orbital should be 120^ but one lone pair of electrons is lying on N -atom, hence bond angle decreases to 115^ . In NO ₂ molecule, N -atom has one unpaired electron in s p^2 -hybrid orbital. The bond angle s