Calamine ore can be used to extract one of the following metals. This metal is: (a) copper (b) mercury (c) aluminium (d) zinc
State one use each of the following non-metals: Copper, Aluminium, Iron, Silver, Gold, Mercury
The two metals which can be extracted just by heating their sulphides in the air are: (a) sodium and copper (b) copper and aluminium (c) potassium and zinc (d) mercury and copper