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b) The bond angle decreases on moving down the group due to decrease in bond pair-bond pair repulsion.
NH3 PH3 ASH3 SbH3 BiH3
107° 94° 92° 91° 90°
NOTE : This can also be explained by the fact that as the size of central atom increases sp3 hybrid orbital becomes more distinct with increasing size of central atom i.e. pure p- orbitals are utilized in M-H bonding
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