arramge in the increasing order of bond angle

NH3, NH4+, NH2-

The increasing order of bond angles is given as:
NH2 < NH3  <  NH4+

Reason:  NH4+ has tetrahedral shape with bond angle 109.5degree. NH3 has trigonal pyramidal shape and has one lone pair which pushes the bond closer. And NH2-  has bent shape and there are two lone pairs present which pushes the bonds even closer than in NHmolecule which makes the angle smaller.

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