In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false?

Which method of purification is represented by the following equation :
Ti (s) + 2I₂ (g) $$\buildrel {523K} \over \longrightarrow $$ TiI₄ (g) $$\buildrel {1700K} \over \longrightarrow $$ Ti (s) + 2I₂ (g)

Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?

During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’ These are