Question

Coordination compounds are widely present in the minerals, plant and animal worlds and are known to play many important functions in the area of analytical chemistry, metallurgy, biological systems and medicine. Alfred Werner's theory postulated the use of two types of linkages (primary and secondary), by a metal atom/ion in a coordination compound. He predicted the geometrical shapes of a large number of coordination entities using the property of isomerism. The Valence Bond Theory (VBT) explains the formation, magnetic behaviour and geometrical shapes of coordination compounds. It, however, fails to describe the optical properties of these compounds. The Crystal Field Theory (CFT) explains the effect of different crystal fields (provided by the ligands taken as point charges) on the degeneracy of d-orbital energies of the central metal atom/ion.

On the basis of crystal field theory, write the electronic configuration for d⁴ ion if Δ₀ < P.

Using valence bond theory, predict the hybridization and magnetic character of [Ni(CN)₄]²⁻. (Atomic number of Ni = 28)

Write the formula of the following complex using IUPAC norms: Dichloridobis (ethane-1,2-diamine) cobalt (III)