(a) Electronic configuration of Ti3+ in [Ti(NH3)6]3+ Ti3+ = 3d1 ; 3d :
↿
4s:
4p :
: s2sp3 hybridisation (b) Electronic configuration of Cr3+ in [Cr(NH3)6]3+ Cr3+ = 3d3 ; 3d
↿
↿
↿
4s :
4p :
: d2sp3 hybridisation (c) Electronic configuration of Co3+ in [Co(NH3)6]3+ ; Co3+ = 3d6 3d :
↿⇂
↿
↿
↿
↿
4s :
4p :
In the presence of strong field ligand NH3, pairing of electrons takes place and hence, octahedral complex, [Co(NH3)6]3+ is diamagnetic. [Co(NH3)6]3+ [inner orbital or low spin complex] (6NH3 molecules)
(d)Electronic configuration of Zn+ in [Zn(NH3)6]2+ Zn2+ = 3d10; 3d :
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
4s :
4p :
4d :
: sp3d2 hybridisation ∴ [Zn(NH3)6]2+ is an outer orbital complex and is diamagnetic.