Coordination Compounds Chapter-Wise Test 14

Correct answer Carries: 4.

Wrong Answer Carries: -1.

The number of geometrical isomers for \( \ce{[Co(NH3)3Cl2(H2O)]^+} \) is:

\( \ce{[Co(NH3)3Cl2(H2O)]^+} \) (octahedral, \( \ce{[Ma3b2c]} \)) has 2 isomers: cis (Cl ligands adjacent) and trans (Cl ligands opposite).

1
3
4
2
4

What type of isomerism exists between \( \ce{[Co(NH3)5(NO2)]Cl2} \) and \( \ce{[Co(NH3)5(ONO)]Cl2} \)?

These differ by the binding atom of \( \ce{NO2^-} \) (N in nitro vs. O in nitrito), exhibiting linkage isomerism.

Geometrical
Ionization
Linkage
Coordination
2

What is the primary valence of Ni in \( \ce{[Ni(en)2Cl2]} \)?

In \( \ce{[Ni(en)2Cl2]} \), en is neutral, 2 \( \ce{Cl^-} \) balance Ni, making Ni +2. Primary valence is the oxidation state, so 2.

3
1
4
2
4

Which pair represents ionization isomerism?

\( \ce{[Cr(NH3)5Cl]SO4} \) and \( \ce{[Cr(NH3)5SO4]Cl} \) differ by exchanging \( \ce{Cl^-} \) and \( \ce{SO4^2-} \) between the coordination sphere and counter ion.

\( \ce{[Cr(NH3)6]^3+} \) and \( \ce{[Cr(NH3)5Cl]^2+} \)
\( \ce{[Cr(NH3)4Cl2]^+} \) (cis and trans)
\( \ce{[Cr(NH3)5NO2]^2+} \) and \( \ce{[Cr(NH3)5ONO]^2+} \)
\( \ce{[Cr(NH3)5Cl]SO4} \) and \( \ce{[Cr(NH3)5SO4]Cl} \)
4

Which complex is optically active?

\( \ce{[Co(en)2Cl2]^+} \) (octahedral) can form a trans isomer (symmetric) and a cis isomer (chiral, non-superimposable), showing optical isomerism.

\( \ce{[Co(NH3)6]^3+} \)
\( \ce{[NiCl4]^2-} \)
\( \ce{[Co(en)2Cl2]^+} \)
\( \ce{[Pt(NH3)2Cl2]} \)
3

Which complex changes its geometry from tetrahedral to square planar when \( \ce{Cl^-} \) ligands are replaced by \( \ce{CN^-} \)?

\( \ce{[NiCl4]^2-} \) (Ni\(^{2+}\), \( d^8 \)) is tetrahedral with weak field \( \ce{Cl^-} \). With strong field \( \ce{CN^-} \), it becomes \( \ce{[Ni(CN)4]^2-} \), square planar.

\( \ce{[CoCl4]^2-} \)
\( \ce{[NiCl4]^2-} \)
\( \ce{[CuCl4]^2-} \)
\( \ce{[FeCl4]^-} \)
2

Which complex has the highest crystal field splitting energy (\( \Delta_o \)) with \( \ce{Co^{3+}} \) as the central ion?

\( \Delta_o \) depends on ligand strength (spectrochemical series: \( \ce{CN^-} > \ce{NH3} > \ce{H2O} > \ce{F^-} \)). \( \ce{[Co(CN)6]^3-} \) with strong field \( \ce{CN^-} \) has the highest \( \Delta_o \).

\( \ce{[CoF6]^3-} \)
\( \ce{[Co(H2O)6]^3+} \)
\( \ce{[Co(CN)6]^3-} \)
\( \ce{[Co(NH3)6]^3+} \)
3

How many moles of \( \ce{AgCl} \) precipitate when 1 mole of \( \ce{[Ni(NH3)4Cl2]Cl2} \) reacts with excess \( \ce{AgNO3} \)?

In \( \ce{[Ni(NH3)4Cl2]Cl2} \), the 2 \( \ce{Cl^-} \) ions outside the coordination sphere are ionizable and precipitate as \( \ce{AgCl} \), while the 2 inside are ligands. Thus, 2 moles form.

2
1
3
4
1

Which ligand can form a chelate ring with a metal ion?

Chelating ligands are polydentate. Oxalate (\( \ce{C2O4^2-} \)) is bidentate, forming a 5-membered ring, unlike unidentate ligands like \( \ce{F^-} \) or \( \ce{NH3} \).

\( \ce{F^-} \)
\( \ce{NH3} \)
\( \ce{C2O4^2-} \)
\( \ce{H2O} \)
3

Which \( d^8 \) metal ion in a tetrahedral field with weak field ligands is paramagnetic?

Ni\(^{2+}\) (\( d^8 \)) in a tetrahedral field (e.g., \( \ce{[NiCl4]^2-} \)) with weak field \( \ce{Cl^-} \) has \( e^4 t_2^4 \), 2 unpaired electrons, making it paramagnetic.

\( \ce{Pd^2+} \)
\( \ce{Pt^2+} \)
\( \ce{Cu^2+} \)
\( \ce{Ni^2+} \)
4

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