(a)[1]
Explain why potassium iodide requires a high temperature to melt.
(b)[2]
Describe how potassium atoms and iodine molecules react to produce potassium ions and iodide ions. Use the idea of electron transfer.
(c)[2]
Predict the substances formed at each electrode during the electrolysis of concentrated aqueous potassium iodide.
(d)[2]
Aqueous potassium iodide reacts with aqueous acidified potassium manganate(VII). Suggest the colour changes seen in this reaction.
(e)[2]
The ionic equation for the reaction between aqueous potassium iodide and aqueous chlorine appears below: $2\text{I}^-(\text{aq}) + \text{Cl}_2(\text{aq}) \rightarrow \text{I}_2(\text{aq}) + 2\text{Cl}^-(\text{aq})$ Explain, in terms of electrons, why this reaction shows both oxidation and reduction.