In the complexes ${\left[ {{\rm{Fe}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{3 + }},{\rm{\;}}{\left[ {{\rm{Fe}}{{\left( {{\rm{CN}}} \right)}_6}} \right]^{3 - }},{\rm{\;}}{\left[ {{\rm{Fe}}{{\left( {{{\rm{C}}_2}{{\rm{O}}_4}} \right)}_3}} \right]^{3 - }}{\rm{\;and}}\,{\rm{\;}}{\left[ {{\rm{FeC}}{{\rm{l}}_6}} \right]^{3 - }},$ more stability is shown by:

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

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

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

${\left[ {{\rm{FeC}}{{\rm{l}}_6}} \right]^{3 - }}$

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NEET UG CHEMISTRY MCQ: CO-ORDINATION COMPOUNDS

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In the complexes

{\left[ {\mathrm{Fe}{{\left( {{\mathrm{H}_2}\mathrm{O}} \right)}_6}} \right]^{3 + }},\mathrm{\;}{\left[ {\mathrm{Fe}{{\left( {\mathrm{CN}} \right)}_6}} \right]^{3 - }},\mathrm{\;}{\left[ {\mathrm{Fe}{{\left( {{\mathrm{C}_2}{\mathrm{O}_4}} \right)}_3}} \right]^{3 - }}\mathrm{\;and}\,\mathrm{\;}{\left[ {\mathrm{FeC}{\mathrm{l}_6}} \right]^{3 - }},

more stability is shown by:

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Correct option: C

{\left[ {\mathrm{Fe}{{\left( {{\mathrm{C}_2}{\mathrm{O}_4}} \right)}_3}} \right]^{3 - }}

Option C ([Fe(C2O4)3]3-) is correct because oxalate (C2O42-) is a bidentate ligand and forms stable chelate complexes. Chelation generally increases stability.

NEET UG CHEMISTRY MCQ: CO-ORDINATION COMPOUNDS

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