Which one of the following is an inner orbital complex as well as diamagnetic in behaviour? (Atomic number : Zn =30, Cr =24 , Co =27, Ni =28 )

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d^2 s p^3 inner octahedral complex & diamagnetic. [ Zn ( NH ₃ )₆ ]²⁺ s p^2 d^2 hybridization (outer) and diamagnetic. [ Cr ( NH ₃ )₆ ]³⁺ d^2 s p^3 (inner) and paramagnetic. [ Ni ( NH ₃ )₆ ]³⁺ s p^3 p^2 (outer) and paramagnetic. Related Theory The main difference between inner and outer orbital complexes is that the hybridization of the atomic orbitals of the central metal atom of inner orbital complex involves inner shell d orbitals whereas the hybridization of the atomic orbitals of the central metal atom of outer