(a)[2]
Because the electrodes are platinum, state the name of each electrode: positive electrode, negative electrode.
(b(i))[2]
At the positive electrode, the reaction is $4\text{OH}^- \rightarrow \text{O}_2 + 2\text{H}_2\text{O} + 4e^-$. Write the reaction at the negative electrode.
(b(ii))[4]
Describe the tests that can be used to identify the gases formed: oxygen and hydrogen.