Correct Answer: (a) Nickel, Zinc, Copper, Aluminium
Solution:Non-Ferrous metals are those minerals which have negligible iron content. Non-ferrous metals are Aluminium, Copper, Zinc, Tin, Titanium, Lead, Nickel etc. In addition to these, some other non-ferrous metals are Gold, Silver, Cobalt, Gallium, Beryllium, Cerium, Tungsten, Mercury, Platinum, Zirconium, Cadmium, Germanium.