State the meaning of the term monodentate ligand.
Fill in the table by giving the formulae and charges of the complexes described: a molybdenum complex with one Mo atom surrounded by carbon monoxide, CO, molecules, and an iron(III) complex containing one $\text{Fe}^{3+}$ ion and several cyanide, $\text{CN}^-$, ions.
Draw a three-dimensional diagram showing the shape of this iron(III) complex. Mark one $180^{\circ}$ bond angle on your diagram.
Excess aqueous ammonia is added to dilute copper(II) sulfate solution. A dark blue complex, $[\text{Cu}(\text{NH}_3)_4(\text{H}_2\text{O})_2]^{2+}$, forms. Write an ionic equation for this reaction.
Explain the cause of colour in copper(II) complexes.
Write an equation for the formation of $Z$ from a solution of $[\text{Cu(NH}_3)_4(\text{H}_2\text{O})_2]^{2+}$. Include the formula and charge of $Z$.
Name the type of reaction when $Z$ is formed from $[\text{Cu(NH}_3)_4(\text{H}_2\text{O})_2]^{2+}$.
State the geometry of $Z$.
State the colour of a solution of $Z$.
Explain why the colour of a solution of $[\text{Cu(NH}_3)_4(\text{H}_2\text{O})_2]^{2+}$ is different from the colour of a solution of $Z$. Refer to the energies of the orbitals involved in your answer.