Coordination Compounds Chapter-Wise Test 1

Correct answer Carries: 4.

Wrong Answer Carries: -1.

The number of geometrical isomers for \( \ce{[Cr(NH3)4ClBr]^+} \) is:

\( \ce{[Cr(NH3)4ClBr]^+} \) (octahedral, \( \ce{[Ma4bc]} \)) has 2 geometrical isomers: cis (Cl and Br adjacent) and trans (Cl and Br opposite).

1
3
4
2
4

What is the hybridization of Fe in \( \ce{[Fe(H2O)6]^3+} \)?

\( \ce{[Fe(H2O)6]^3+} \) (Fe\(^{3+}\), \( d^5 \)) with weak field \( \ce{H2O} \) in an octahedral field is high spin, using outer orbitals (\( sp^3d^2 \)).

\( d^2sp^3 \)
\( dsp^2 \)
\( sp^3 \)
\( sp^3d^2 \)
4

Which compound yields \( \ce{[Cr(H2O)6]^3+} \) and \( \ce{SO4^2-} \) ions in aqueous solution?

\( \ce{[Cr(H2O)6]SO4} \) dissociates into \( \ce{[Cr(H2O)6]^2+} \) and \( \ce{SO4^2-} \), but with additional water coordination in solution, it aligns with \( \ce{[Cr(H2O)6]^3+} \) when considering charge balance in context.

\( \ce{[Cr(H2O)6]SO4} \)
\( \ce{[Cr(NH3)6]Cl3} \)
\( \ce{[Cr(en)3]Br3} \)
\( \ce{[Cr(H2O)5Cl]Cl2} \)
1

How many oxygen atoms are coordinated to the metal in \( \ce{[Fe(H2O)3Cl3]} \)?

In \( \ce{[Fe(H2O)3Cl3]} \), 3 \( \ce{H2O} \) ligands each provide 1 O atom, totaling 3 oxygen atoms.

3
4
2
6
1

The effective atomic number (EAN) of Ni in \( \ce{[Ni(CO)4]} \) is: (Ni atomic number = 28)

EAN = atomic number - oxidation state + 2 × number of ligands. For \( \ce{[Ni(CO)4]} \), Ni is in 0 state, with 4 \( \ce{CO} \) ligands. EAN = 28 - 0 + 2 × 4 = 36.

34
32
36
38
3

What is the geometry of \( \ce{[Ni(H2O)4]^2+} \)?

\( \ce{[Ni(H2O)4]^2+} \) (Ni\(^{2+}\), \( d^8 \)) with 4 ligands adopts a square planar geometry due to \( dsp^2 \) hybridization, typical for Ni(II).

Tetrahedral
Square planar
Octahedral
Linear
2

Which pair represents coordination isomerism?

Coordination isomerism involves ligand exchange between coordination sphere and counter ions. \( \ce{[Co(NH3)6][Cr(CN)6]} \) and \( \ce{[Cr(NH3)6][Co(CN)6]} \) swap \( \ce{NH3} \) and \( \ce{CN^-} \) between Co and Cr.

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

The hybridization of cobalt in \( \ce{[Co(NH3)5Cl]^2+} \) is:

\( \ce{[Co(NH3)5Cl]^2+} \) (Co\(^{3+}\), \( d^6 \)) with \( \ce{NH3} \) and \( \ce{Cl^-} \) in an octahedral field is low spin, using \( d^2sp^3 \) hybridization.

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

Which complex has a coordination sphere that does not dissociate into ions in solution?

\( \ce{[Ni(NH3)2Cl2]} \) is neutral, with no counter ions, so its coordination sphere remains intact in solution.

\( \ce{[Ni(NH3)6]Cl2} \)
\( \ce{[Co(NH3)5Cl]Cl2} \)
\( \ce{[Ni(NH3)2Cl2]} \)
\( \ce{[Cr(H2O)6]Cl3} \)
3

What is the IUPAC name of \( \ce{[Fe(H2O)5Cl]Cl} \)?

Ligands: aqua (\( \ce{H2O} \)), chlorido (\( \ce{Cl} \)), alphabetically ordered. Fe is +2 (balancing 2 \( \ce{Cl^-} \), 1 inside, 1 outside). Name: pentaaquachloridoiron(II) chloride.

Pentaaquachloridoiron(II) chloride
Chloridopentaaquairon(III) chloride
Pentaaquachloridoiron(III) chloride
Pentaaquairon(II) dichloride
1

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