JEE CHEMISTRY MCQ: CO-ORDINATION COMPOUNDS

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Analyzing +4 | -1

Assertion:

\left[{Ni}({CN})_4\right]^{-2}

has zero unpaired electron while that of

\left[{NiCl}_4\right]^{-2}

has two unpaired

{e}^{-}

Reason:

\left[{Ni}({CN})_4\right]^{-2}

has strong crystal field while

\left[{NiCl}_4\right]^{-2}

has weak crystal field.

View answer and explanation

Correct option: A

Assertion is true, Reason is true and Reason is correct explanation for Assertion

Option A (Assertion is true, Reason is true and Reason is correct explanation for Assertion) is correct because the cyanide ligand (

CN^−

) is a strong field ligand causing pairing of electrons, while chloride (

Cl^−

) is a weak field ligand resulting in unpaired electrons.

More Questions from CO-ORDINATION COMPOUNDS

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\mathrm{K}\left[ {\mathrm{Ag}{{\left( {\mathrm{CN}} \right)}_2}} \right]

\left[ {\mathrm{PtC}{\mathrm{l}_2}{{\left( {\mathrm{N}{\mathrm{H}_3}} \right)}_4}} \right]\mathrm{B}{\mathrm{r}_2}\mathrm{\;and\;}\left[ {\mathrm{PtB}{\mathrm{r}_2}{{\left( {\mathrm{N}{\mathrm{H}_3}} \right)}_4}} \right]\mathrm{C}{\mathrm{l}_2}\mathrm{\;}

\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]\left[\mathrm{PtCl}_4\right]

\left[{Co}\left({NH}_3\right)_5\left({NO}_2\right)\right] {Cl}_2

\left[{Co}\left({NH}_3\right)_5({ONO})\right] {Cl}_2 \ldots \ldots \ldots

\left[{Cu}\left({NH}_3\right)_4\right]\left[{PtCl}_4\right] \,\, \& \,\, \left[{Pt}\left({NH}_3\right)_4\right]\left[{CuCl}_4\right] \ldots \ldots \ldots

\left[{Pt}\left({NH}_3\right)_4 {Cl}_2\right] {Br}_2 \, \, \& \, \, \left[{Pt}\left({NH}_3\right)_4 {Br}_2\right]{Cl}_2 \ldots \ldots \ldots