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Chemistry · 2025 · 3 marks
Coordination CompoundsDefinitions of Some Important Terms Pertaining to Coordination Compounds3 marksAnalyseshort answer
CBSE 2025 · Region 5 · Set 3 · Q24
(a) Write the name and structure of a hexadentate ligand. 1 (b) Why is [ Ni ( CN )_4]^2- square planar while [ Ni ( CO )_4] is tetrahedral? [Atomic…
(a)
Write the name and structure of a hexadentate ligand. $\displaystyle 1$
(b)
Why is $\displaystyle \left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}$ square planar while $\displaystyle \left[\mathrm{Ni}(\mathrm{CO})_{4}\right]$ is tetrahedral ? [Atomic number : $\displaystyle \mathrm{Ni}=28$ ]
Marking-scheme solution
(a)
Ethylenediamine tetraacetate ion /EDTA4-
(b)
Oxidation state of Nickel is +$\displaystyle 2$,CN- being a strong ligand results in pairing of electrons
,hybridization is dsp2,hence geometry is Square planar
whereas in Ni(CO)$\displaystyle 4$, oxidation sate of Nickel is $\displaystyle 0$(Zero),hybridization is sp3,hence
geometry is tetrahedral. (Or Diagrammatic explanation for both)
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