JEE MAIN - Chemistry (2004 - No. 48)
Which one of the following complexes in an outer orbital complex?
[Fe(CN)6]4-
[Ni(NH3)6]2+
[Co(NH3)6]3+
[Mn(CN)6]4-
Explanation
Hybridisation
$$\mathop {{{\left[ {Fe{{\left( {CN} \right)}_6}} \right]}^{4 - }},}\limits_{{d^2}s{p^3}} \,\,\mathop {{{\left[ {Mn{{\left( {CN} \right)}_6}} \right]}^{4 - }},}\limits_{{d^2}s{p^3}} $$
$$\mathop {{{\left[ {Co{{\left( {N{H_3}} \right)}_3}} \right]}^{3 + }},}\limits_{{d^2}s{p^3}} \,\,\mathop {{{\left[ {Ni{{\left( {N{H_3}} \right)}_6}} \right]}^{2 + }}}\limits_{s{p^3}{d^2}} $$
Hence $${\left[ {Ni{{\left( {N{H_3}} \right)}_6}} \right]^{2 + }}$$ is outer orbital complex.
$$\mathop {{{\left[ {Fe{{\left( {CN} \right)}_6}} \right]}^{4 - }},}\limits_{{d^2}s{p^3}} \,\,\mathop {{{\left[ {Mn{{\left( {CN} \right)}_6}} \right]}^{4 - }},}\limits_{{d^2}s{p^3}} $$
$$\mathop {{{\left[ {Co{{\left( {N{H_3}} \right)}_3}} \right]}^{3 + }},}\limits_{{d^2}s{p^3}} \,\,\mathop {{{\left[ {Ni{{\left( {N{H_3}} \right)}_6}} \right]}^{2 + }}}\limits_{s{p^3}{d^2}} $$
Hence $${\left[ {Ni{{\left( {N{H_3}} \right)}_6}} \right]^{2 + }}$$ is outer orbital complex.
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