The reducing property of the hydrides of VA group increases from NH3 to BiH3 NH3<PH3<AsH3<SbH3<BiH3 The tendency to donate lone pair or basic strength decreases from NH3 to BiH3. NH3>PH3>AsH3>SbH3>BiH3 Thermal stability of VA group hydrides decrease from NH3 to BiH3 NH3>PH3>AsH3>SbH3>BiH3 Bond angle of VA group hydrides decreases from NH3 to BiH3 NH3>PH3>AsH3>SbH3>BiH3