Chemistry 9701 · AS & A Level · Chemistry of transition elements

Chemistry of transition elements — practice question

(a(i))[1]

Define what is meant by monodentate ligand.

(a(ii))[1]

Define what is meant by transition element complex.

(a(iii))[1]

Explain why transition elements form complexes.

(b(i))[1]

Complete Table 6.1 by giving the geometry of the first three complexes. Each complex is square planar, tetrahedral or octahedral.

(b(ii))[1]

Use complexes $[\text{Au(dien)(H}_2\text{O)}_2\text{Cl}]^{2+}$ and $\text{Au(dien)Cl}_3$ to write an equation showing ligand exchange.

(b(iii))[1]

Draw the three-dimensional structure of $\text{Au(dien)Cl}_3$ in the box. The $\text{dien}$ ligand may be shown as indicated.

(b(iv))[1]

Draw the three-dimensional structure of $\text{Ni(PH}_3)_2\text{Cl}_2$ in the box provided.

(b(v))[1]

One of the complexes, $[\text{Rh(en)}_2\text{Cl}_2]^+$ or $[\text{Rh(CO)}_2\text{Cl}_2]^+$, can exist in three isomeric forms. Identify this complex and name the types of isomerism shown.

(iii)[1]

Draw the three-dimensional structure of $\text{Au(dien)Cl}_3$ in the box. The dien ligand may be drawn as shown.

(iv)[1]

Draw the three-dimensional structure of $\text{Ni(PH}_3)_2\text{Cl}_2$ in the box provided.

(v)[1]

One of the complexes, $[\text{Rh(en)}_2\text{Cl}_2]^+$ or $[\text{Rh(CO)}_2\text{Cl}_2]^+$, can exist in three isomeric forms. Identify this complex and the types of isomerism shown.

(vi)[2]

Draw the three-dimensional structures of the two isomers of $[\text{Ni(H}_2\text{O})_2(\text{NH}_3)_4]^{2+}$ in the boxes and identify the type of isomerism shown.

Worked solution & mark scheme

This 13-mark question has a full step-by-step worked solution and mark scheme. One marking point: Supplies one lone pair to a metal atom or ion

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