When concentrated aqueous magnesium iodide is electrolysed with graphite electrodes, what product is formed at each electrode?
Using graphite electrodes, molten magnesium iodide is electrolysed. Write the ionic half-equation at each electrode for this electrolysis.
Describe a test for iodide ions in aqueous solution. State what you would see if the test is positive.
Explain, in terms of electron transfer, why iodide ions act as a reducing agent in this reaction: $2\text{I}^- + \text{MnO}_2 + 4\text{H}^+ \rightarrow \text{Mn}^{2+} + \text{I}_2 + 2\text{H}_2\text{O}$
State the name used for a reaction in which oxidation and reduction happen together.
Finish Fig. 4.1 so that it shows the dot-and-cross diagram for a phosphorus(III) iodide molecule. Display only the outer-shell electrons.