For the following chemical species, (i) NO₂^- (ii) NO₂^+ (iii) NH₄^+ (iv) NO₃^- The correct decreasing order of their central bond angles is

Step-by-step solution

The bond angles of the given species can be determined by finding the hybridization and the number of lone pairs on the central nitrogen atom. For NO₂^+ , the central nitrogen atom has 2 bond pairs and 0 lone pairs. The hybridization is sp , resulting in a linear geometry with a bond angle of 180^ . For NO₃^- , the central nitrogen atom has 3 bond pairs and 0 lone pairs. The hybridization is sp^2 , resulting in a trigonal planar geometry with a bond angle of 120^ . For NO₂^- , the central nitrogen atom has 2 bond p