Bond angle in the following conversion decreases except when
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Difference between NH3,NH4+,NH2- according to vesper
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In All of the Molecules Nitrogen has sp3 hybridization , the only difference is in the angle of HNH bond which is different .
In NH3 - There is 1 lone pair and hence due to Lp Bp repulsion the angle decreases a little .
NH4+ Has no lone pair
NH2- has two lone pair and therefore the decrease in bond angle is maximum .
Also All of the Have different net dipole moments .
Descending Order of Dipole Moments : NH2- >NH3>NH4+
Descending order of Bond angle : NH4+ >NH3> NH2-
Note : For Every Lone pair bond angle approximately decreases by 2.5°
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