Coordination Compounds Chapter-Wise Test 20

Correct answer Carries: 4.

Wrong Answer Carries: -1.

The central metal ion in \( \ce{[Fe(CN)4]^2-} \) uses which hybrid orbitals?

\( \ce{[Fe(CN)4]^2-} \) (Fe\(^{2+}\), \( d^6 \)) with 4 ligands is square planar (strong field \( \ce{CN^-} \)), using \( dsp^2 \) hybridization.

\( sp^3 \)
\( dsp^2 \)
\( d^2sp^3 \)
\( sp^3d^2 \)
2

What is the coordination number of nickel in \( \ce{[Ni(en)2(H2O)2]^2+} \)?

Each ethane-1,2-diamine (en) is bidentate (2 donor atoms), and each \( \ce{H2O} \) is unidentate. In \( \ce{[Ni(en)2(H2O)2]^2+} \), 2 en (4 atoms) + 2 \( \ce{H2O} \) = 6.

6
4
5
3
1

Which complex can show optical isomerism?

\( \ce{[Co(en)2(H2O)Cl]^2+} \) (octahedral) with 2 bidentate en, 1 \( \ce{H2O} \), and 1 \( \ce{Cl^-} \) forms a chiral complex without symmetry.

\( \ce{[Co(NH3)6]^3+} \)
\( \ce{[CuCl4]^2-} \)
\( \ce{[Co(en)2(H2O)Cl]^2+} \)
\( \ce{[Ni(NH3)4]^2+} \)
3

Which complex shows optical isomerism?

Optical isomerism occurs in chiral complexes. \( \ce{[Co(en)3]^3+} \) (octahedral, with 3 bidentate en ligands) lacks a plane of symmetry, forming non-superimposable mirror images (d and l).

\( \ce{[Co(NH3)6]^3+} \)
\( \ce{[NiCl4]^2-} \)
\( \ce{[Co(en)3]^3+} \)
\( \ce{[PtCl4]^2-} \)
3

Which complex has a \( d^5 \) metal ion with the maximum possible unpaired electrons in a tetrahedral field?

\( \ce{[MnCl4]^2-} \) (Mn\(^{2+}\), \( d^5 \)) in a tetrahedral field with weak field \( \ce{Cl^-} \) is high spin (\( e^2 t_2^3 \)), with 5 unpaired electrons.

\( \ce{[Fe(CN)6]^3-} \)
\( \ce{[MnCl4]^2-} \)
\( \ce{[Mn(H2O)6]^2+} \)
\( \ce{[FeCl6]^3-} \)
2

What is the IUPAC name of \( \ce{[Co(NH3)4(H2O)Cl]Cl2} \)?

Ligands are named alphabetically: ammine (\( \ce{NH3} \)), aqua (\( \ce{H2O} \)), chlorido (\( \ce{Cl} \)). There are 4 \( \ce{NH3} \), 1 \( \ce{H2O} \), and 1 \( \ce{Cl} \) in the complex. Co’s oxidation state is +3 (since \( \ce{[Co(NH3)4(H2O)Cl]^2+} \) balances 2 \( \ce{Cl^-} \)). Name: tetraammineaquachloridocobalt(III) chloride.

Tetraammineaquachloridocobalt(III) chloride
Tetraamminechloridoaquacobalt(III) chloride
Aquatetraamminechloridocobalt(III) chloride
Tetraammineaquacobalt(III) dichloride
1

Which complex has a magnetic moment closest to that of a free \( d^5 \) ion?

\( \ce{[Mn(H2O)6]^2+} \) (Mn\(^{2+}\), \( d^5 \)) with weak field \( \ce{H2O} \) is high spin (\( t_{2g}^3 e_g^2 \)), 5 unpaired electrons, matching a free \( d^5 \) ion’s magnetic moment.

\( \ce{[Fe(CN)6]^3-} \)
\( \ce{[CoF6]^3-} \)
\( \ce{[Mn(H2O)6]^2+} \)
\( \ce{[Cr(NH3)6]^3+} \)
3

Which ligand causes the weakest crystal field splitting in a tetrahedral complex?

From the spectrochemical series (\( \ce{Cl^-} < \ce{F^-} < \ce{NH3} < \ce{CN^-} \)), \( \ce{Cl^-} \) is the weakest field ligand, causing the smallest \( \Delta_t \).

\( \ce{F^-} \)
\( \ce{NH3} \)
\( \ce{Cl^-} \)
\( \ce{CN^-} \)
3

What is the charge of the coordination sphere in \( \ce{[Fe(NH3)4Cl2]NO3} \)?

In \( \ce{[Fe(NH3)4Cl2]NO3} \), \( \ce{[Fe(NH3)4Cl2]^+} \) balances \( \ce{NO3^-} \). Fe is +3, 2 \( \ce{Cl^-} \) = -2, 4 \( \ce{NH3} \) = 0. Charge = +3 - 2 = +1.

+2
-1
+1
0
3

How many geometrical isomers are possible for \( \ce{[Co(NH3)2(H2O)2Cl2]^+} \) excluding optical isomers?

\( \ce{[Co(NH3)2(H2O)2Cl2]^+} \) (octahedral, \( \ce{[Ma2b2c2]} \)) has 3 geometrical isomers: all cis, cis-trans-cis, and all trans.

2
4
1
3
3

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