Certain metals can be extracted from their salts (usually halides: those containing Group 17 elements such as chlorine, fluorine, bromine or iodine) by the process of electrolysis. In a typical electrolysis cell like that in the diagram, a sample of magnesium chloride (MgCl2) was placed and heated until molten. From the list below, select the three true statements with regards to the electrolysis of magnesium chloride:
(i) Molten magnesium chloride conducts electricity and so allows the circuit to be completed in the electrolysis cell.
(ii) Molten magnesium chloride does not conduct electricity.
(iii) The chloride ions are reduced at the anode to give Cl2 gas.
(iv)The chloride ions are oxidised at the anode to give Cl2 gas.
(v) Magnesium ions are reduced at the cathode to give magnesium atoms.
(vi) Magnesium ions are oxidised at the cathode to give magnesium atoms.