Deduce the oxidation state for manganese in $[\text{MnCl}_4]^{2-}$.
There are no $180^{\circ}$ bond angles in the $[\text{MnCl}_4]^{2-}$ complex. Draw a three-dimensional diagram to represent the shape of the $[\text{MnCl}_4]^{2-}$ complex. State one bond angle on your diagram.
A solution containing $[\text{Co(H}_2\text{O)}_6]^{2+}$ is treated with excess $\text{NaOH}(aq)$. Write an equation for the reaction. State one observation that can be made straight away after the reaction, including the colour and state of the cobalt-containing product.
A solution containing $[\text{Co(H}_2\text{O)}_6]^{2+}$ is treated with excess $\text{NH}_3(aq)$. Write an equation for the reaction. State one observation that can be made straight away after the reaction, including the colour and state of the cobalt-containing product.
A solution containing $[\text{Co(H}_2\text{O)}_6]^{2+}$ is treated with excess $\text{NaCl}(aq)$. Write an equation for the reaction. State one observation that can be made straight away after the reaction, including the colour and state of the cobalt-containing product.
Name the reaction type that occurs in (b)(iii).
Define what is meant by a bidentate ligand.
Draw three-dimensional diagrams for the two optical isomers of $[\text{Co(NH}_3)_2(\text{en})_2]^{2+}$. Each en ligand may be shown as $\text{H}_2\text{NCH}_2\text{CH}_2\text{NH}_2$.