THE “0-N-O” BOND ANGLE IS MINIMUM IN N2O,NO2+,NO2- OR NO3-.EXPLAIN

The hybridisation of n2o is sp=> linear molecule=>bond angle 180
the hybridisation of no2+ is also sp=> linear=> bond angle 180
the hybridisation of no2- is sp2=> trigonal planar=> bond angle may be 120 or lesser
the hybridisation of no3- is sp2=> trigonal planar=> bond angle may 120 or lesser
 Let us compare no2- and no3-
no2- has lone pair hence bond angle further decreases
no3-has no lone pair hence bond angle is 120

Therefore least bond angle is of NO2-