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Solution


Q.

Which of the following complex is octahedral, diamagnetic and the most stable               [2023]
1 [Co(H2O)6] Cl2  
2 K3[Co(CN)6]  
3 [Ni(NH3)6] Cl2  
4 Na3[CoCl6]  

Ans.

(2)

In K3[Co(CN)6], Co is in +3 oxidation state. Due to the presence of strong field ligand, i.e., —CN, pairing of electrons occurs and hence number of unpaired electrons becomes zero.

Therefore, this complex is octahedral (d2sp3), diamagnetic and the most stable (CFSE=-2.4 Δ0).