CBSE Class 12-science Answered
(a) What is a ligand? Give an example of a
bidentate ligand.
(b) Explain as to how the two complexes of
nickel, [Ni(CN)4]2- and Ni(CO)4, have
different structures but do not differ in their magnetic behaviour. (Ni = 28)
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
Expert Answer
(a) Ligand: The ions or molecules bound to the central atom/ion in the coordination entity are called ligands.
ex. bidentate ligand: ethane-1,2-diamine or oxalate ion.
(b) In [Ni(CN)4]2-, nickel is Ni2+, (3d8), with strong Ligand like CN-, all the electrons are paired up in four d-orbitals resulting into dsp hybridization giving square planar structure and diamagnetic character.
In Ni(CO)4:, nickel is in zero valence state , (3d84s2), with strong Ligand like CO,4s2 electrons are pushed to the d-orbitals resulting into sp3 hybridization giving tetrahedral shape and diamagnetic in nature.
Answered by | 04 Jun, 2014, 03:23: PM
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