Question

a) In which of the following, the central atom/ion is in zero oxidation state.

i) [Ni(CN)₄]^2-

ii) [NiCl₄]^2-

iii) [Ni(CO)₄]

iv) [Ni(NH₃)₅]²⁺

b) [Ni(CN)₄]^2- has square planar structure and it is diamagnetic.

i) On the basis of valence bond theory explain why [Ni(CN)₄)^2- exhibit these properties.

ii) Identify the ligand in the above-mentioned complex

Answer 1

a) iii) or [NiCo)₄]

b) i) dsp² hybridisation or No unpaired electrons or CN is a strong field ligand.

ii) CN- or cyanide ion