Aluminum - Bauxite, Corundum, Feldspar, Cryolite
Iron - Magnetite, Siderite, Haematite
Copper - Cuprite, Copper glance, Copper pyrites
Zinc - Zinc blende, Zincite, Calamine
Addition of iron or zinc to copper sulphate results in precipitation of copper owing to
Iron, Zinc and Copper are examples of ___ .