JEE MAIN - Chemistry (2008 - No. 19)
In which of the following octahedral complexes of Co (at. no. 27), will the magnitude of $$\Delta _o$$ be the highest?
[Co(CN)6]3−
[Co(C2O4)3]3−
[Co(H2O)6]3+
[Co(NH3)6]3+
Paliwanag
In octahedral complex the magnitude of $${\Delta _o}$$ will be highest in a complex having strongest ligand. Of the given ligands $$C{N^ - }$$ is strongest so $${\Delta _o}$$ will be highest for $${\left( {Co{{\left( {CN} \right)}_6}} \right)^{3 - }}.$$ Thus option $$(a)$$ is correct.