Question

write the hybridisation and magnetic character [Co(C2O4)Cl3]​

Answer 1

The hybridisation is d2sp3

It is an exception of CFT and cannot be explained appropriately by the theory

BUT just to remember it you can say that since Oxalate will form a chellate ring hence will increase the CFSE and thus pairing of electrons will occur in t2g orbitals

Hence 2d ,1 s , 3 p orbitals are available for hybridisation