Give the name of one ore of iron. Which iron compound is present in this ore ? Write its chemical formula.

58 Which gas is produced during the extraction of aluminium? At which electrode is this gas produced? 59 Which metal is extracted from bauxite ore? 59 Describe the extraction of zinc metal from its sulphide ore (zinc blende). Write equations of the reactions involved. 59 Explain why, the galvanized iron article is protected against rusting even if the zinc layer is broken.