Coordination Compounds Chapter-Wise Test 3

Correct answer Carries: 4.

Wrong Answer Carries: -1.

The number of geometrical isomers for \( \ce{[Ni(NH3)2(H2O)2Cl2]} \) is:

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

2
1
4
3
4

Which complex has a coordination number of 6 and exhibits geometrical isomerism?

\( \ce{[Co(NH3)4Cl2]^+} \) (octahedral, 6 ligands) has 4 \( \ce{NH3} \) and 2 \( \ce{Cl^-} \), showing cis and trans isomers.

\( \ce{[Co(NH3)6]^3+} \)
\( \ce{[Fe(CN)6]^4-} \)
\( \ce{[Ni(H2O)6]^2+} \)
\( \ce{[Co(NH3)4Cl2]^+} \)
4

How many ligands in \( \ce{[Cr(en)2(H2O)Cl]^2+} \) are bidentate?

In \( \ce{[Cr(en)2(H2O)Cl]^2+} \), en is bidentate (2 ligands), while \( \ce{H2O} \) and \( \ce{Cl^-} \) are unidentate. Thus, 2 are bidentate.

1
2
3
0
2

The magnetic moment of \( \ce{[FeF6]^3-} \) is approximately: (Fe atomic number = 26)

Fe\(^{3+}\) (\( d^5 \)) in \( \ce{[FeF6]^3-} \) (octahedral) with weak field \( \ce{F^-} \) is high spin (5 unpaired electrons). Magnetic moment = \( \sqrt{5(5+2)} = \sqrt{35} \approx 5.92 \) BM.

1.73 BM
3.87 BM
2.83 BM
5.92 BM
4

Which complex follows Werner’s theory by having a primary valence satisfied by sulfate ions?

In \( \ce{[Ni(H2O)6]SO4} \), Ni is +2 (primary valence), balanced by \( \ce{SO4^2-} \) as the counter ion, consistent with Werner’s theory.

\( \ce{[Ni(H2O)6]SO4} \)
\( \ce{[Co(NH3)6]Cl3} \)
\( \ce{[Cr(en)3]Cl3} \)
\( \ce{[Fe(CN)6]^4-} \)
1

What is the IUPAC name of \( \ce{[Ni(H2O)2(NH3)2Cl2]} \)?

Ligands are named alphabetically: ammine (\( \ce{NH3} \)), aqua (\( \ce{H2O} \)), chlorido (\( \ce{Cl} \)). Ni is +2 (neutral complex). Name: diamminediaquadichloridonickel(II).

Diamminediaquadichloridonickel(II)
Diaquadiamminedichloridonickel(III)
Dichloridodiamminediaquanickel(II)
Diamminediaquadinickel(II) dichloride
1

The magnetic moment of \( \ce{[CoCl4]^2-} \) is approximately: (Co atomic number = 27)

Co\(^{2+}\) (\( d^7 \)) in \( \ce{[CoCl4]^2-} \) (tetrahedral) with weak field \( \ce{Cl^-} \) is high spin (3 unpaired electrons). Magnetic moment = \( \sqrt{3(3+2)} = \sqrt{15} \approx 3.87 \) BM.

1.73 BM
2.83 BM
5.92 BM
3.87 BM
4

Which complex has a higher crystal field splitting energy (\( \Delta_o \)) with \( \ce{CN^-} \) ligands compared to \( \ce{NH3} \) ligands?

\( \ce{[Fe(CN)6]^4-} \) has \( \ce{CN^-} \), a stronger field ligand than \( \ce{NH3} \) (spectrochemical series: \( \ce{NH3} < \ce{CN^-} \)), resulting in a larger \( \Delta_o \).

\( \ce{[Fe(NH3)6]^2+} \)
\( \ce{[Ni(NH3)6]^2+} \)
\( \ce{[Fe(CN)6]^4-} \)
\( \ce{[Co(NH3)6]^3+} \)
3

The magnetic moment of \( \ce{[Cr(H2O)6]^3+} \) is approximately: (Cr atomic number = 24)

Cr\(^{3+}\) (\( d^3 \)) in \( \ce{[Cr(H2O)6]^3+} \) (octahedral) with weak field \( \ce{H2O} \) has \( t_{2g}^3 \), 3 unpaired electrons. Magnetic moment = \( \sqrt{3(3+2)} = \sqrt{15} \approx 3.87 \) BM.

1.73 BM
5.92 BM
2.83 BM
3.87 BM
4

Which complex has the smallest crystal field splitting energy (\( \Delta_o \)) among the following?

\( \ce{[FeCl6]^4-} \) has \( \ce{Cl^-} \), the weakest field ligand in the spectrochemical series (\( \ce{Cl^-} < \ce{H2O} < \ce{NH3} < \ce{CN^-} \)), giving the smallest \( \Delta_o \).

\( \ce{[Fe(H2O)6]^2+} \)
\( \ce{[Fe(NH3)6]^2+} \)
\( \ce{[FeCl6]^4-} \)
\( \ce{[Fe(CN)6]^4-} \)
3

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