In which of the following octahedral complexes of ${{\rm{Co}}}$ (at. No. 27), will be magnitude of ${\Delta _0}$ be the highest?

${\left[ {{\rm{Co}}{{\left( {{\rm{CN}}} \right)}_6}} \right]^{3 - }}$

${\left[ {{\rm{Co}}{{\left( {{{\rm{C}}_2}{{\rm{O}}_4}} \right)}_3}} \right]^{3 - }}$

${\left[ {{\rm{Co}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{3 + }}$

${\left[ {{\rm{Co}}{{\left( {{\rm{N}}{{\rm{H}}_3}} \right)}_6}} \right]^{3 + }}$

NEET UG CHEMISTRY MCQ: CO-ORDINATION COMPOUNDS

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Understanding +4 | -1

In which of the following octahedral complexes of

{\mathrm{Co}}

(at. No. 27), will be magnitude of

{\Delta _0}

be the highest?

View answer and explanation

Correct option: A

{\left[ {\mathrm{Co}{{\left( {\mathrm{CN}} \right)}_6}} \right]^{3 - }}

Option A (

{\left[ {\mathrm{Co}{{\left( {\mathrm{CN}} \right)}_6}} \right]^{3 - }}

) is correct because cyanide is a strong field ligand, leading to a large splitting (

\Delta_o