1. Aluminium is produced by electrolysing a molten solution of alumina, Al2O3, in cryolite, Na3AlF6, using graphite electrodes.(a) Explain why a molten solution of the alumina dissolved in cryolite is used rather than just using molten alumina.(b) State the half-equations for the reactions occurring at (i) the cathode (negative electrode) and (ii) the anode (positive electrode) during the electrolysis.