Coordination Compounds Chapter-Wise Test 1

Correct answer Carries: 4.

Wrong Answer Carries: -1.

How many ionizable chloride ions are present in \( \ce{[Co(NH3)4Cl2]Cl} \)?

In \( \ce{[Co(NH3)4Cl2]Cl} \), the \( \ce{Cl^-} \) outside the coordination sphere is ionizable. The 2 \( \ce{Cl^-} \) inside are ligands and not ionizable. Thus, 1 \( \ce{Cl^-} \) ionizes.

1
2
3
0
1

Which complex exhibits linkage isomerism?

Linkage isomerism occurs with ambidentate ligands like \( \ce{NO2^-} \), which can bind via N or O. \( \ce{[Co(NH3)5NO2]^2+} \) can form \( \ce{[Co(NH3)5ONO]^2+} \), showing linkage isomerism.

\( \ce{[Co(NH3)6]^3+} \)
\( \ce{[Co(NH3)5NO2]^2+} \)
\( \ce{[CoCl2(NH3)4]^+} \)
\( \ce{[Co(en)2Cl2]^+} \)
2

Which complex has ligands arranged in a meridional configuration as one of its geometrical isomers?

\( \ce{[Co(NH3)3Cl3]} \) (octahedral, \( \ce{[Ma3b3]} \)) can have a meridional (mer) isomer where 3 \( \ce{Cl^-} \) ligands are in a plane.

\( \ce{[Co(NH3)3Cl3]} \)
\( \ce{[Co(NH3)4Cl2]^+} \)
\( \ce{[Ni(NH3)4]^2+} \)
\( \ce{[Fe(CN)6]^4-} \)
1

What is the coordination number of the cobalt ion in the compound \( \ce{[Co(NH3)6]Cl3} \)?

The coordination number is the number of ligand donor atoms directly bonded to the central metal ion. In \( \ce{[Co(NH3)6]Cl3} \), there are 6 \( \ce{NH3} \) ligands, each unidentate, so the coordination number is 6.

6
3
4
5
1

How many geometrical isomers are possible for \( \ce{[Cr(H2O)3Cl3]} \) excluding optical isomers?

\( \ce{[Cr(H2O)3Cl3]} \) (octahedral, \( \ce{[Ma3b3]} \)) has 2 geometrical isomers: facial (fac) and meridional (mer).

3
1
4
2
3

Which complex has a coordination sphere that conducts electricity in solution due to 3 ionizable ions?

\( \ce{[Co(NH3)6]Cl3} \) dissociates into \( \ce{[Co(NH3)6]^3+} \) and 3 \( \ce{Cl^-} \), producing 4 ions total, but the sphere itself is associated with 3 counter ions.

\( \ce{[Co(NH3)5Cl]Cl2} \)
\( \ce{[Co(NH3)6]Cl3} \)
\( \ce{[Ni(NH3)4]Cl2} \)
\( \ce{[Fe(H2O)6]SO4} \)
2

What is the oxidation state of cobalt in \( \ce{[Co(en)2Cl2]NO3} \)?

In \( \ce{[Co(en)2Cl2]NO3} \), \( \ce{[Co(en)2Cl2]^+} \) balances \( \ce{NO3^-} \). Each en is neutral, each \( \ce{Cl^-} \) is -1. Thus, \( x + 0 + 2(-1) = +1 \), so \( x = +3 \).

+3
+2
+1
+4
1

Which ligand in \( \ce{[Co(NH3)4(SCN)Cl]^+} \) can be replaced to form a linkage isomer?

\( \ce{SCN^-} \) is ambidentate, binding via S (thiocyanato) or N (isothiocyanato), allowing linkage isomerism when replaced or reoriented.

\( \ce{NH3} \)
\( \ce{Cl^-} \)
\( \ce{NH3} \) and \( \ce{Cl^-} \)
\( \ce{SCN^-} \)
4

How many ligands in \( \ce{[Cr(en)2(H2O)2]^3+} \) contribute to its chirality?

\( \ce{[Cr(en)2(H2O)2]^3+} \) is octahedral with 2 en (bidentate) and 2 \( \ce{H2O} \) (unidentate). The 2 en ligands create the propeller-like structure causing chirality.

4
1
3
2
3

Which ligand is present in the complex \( \ce{[Co(en)3]^3+} \)?

\( \ce{[Co(en)3]^3+} \) contains 3 ethane-1,2-diamine (en) ligands, a bidentate ligand denoted as \( \ce{H2NCH2CH2NH2} \).

\( \ce{NH3} \)
\( \ce{H2NCH2CH2NH2} \)
\( \ce{Cl^-} \)
\( \ce{H2O} \)
2

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