How many of the following ores belong to either aluminium or copper?
Bauxite, Siderite, Diaspore, Cuprite, Malachite, Carborundum, Kaolinite, Azurite,
Calamine, Cerussite, Cassiterite, Dolomite
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Solution
The answer is 6
Aluminium ores are
Bauxite[Al2O3.nH2O],Diaspore[AlO(OH)],Kaolinite[Al2Si2O5(OH)4]
Copper ores are
Cuprite[Cu2O],Malachite[Cu2(CO3)(OH)2], Azurite[Cu3(CO3)2(OH)2].
The other ores are
Siderite-[FeCO3]
Carborundum-[SiC]
Calamine-[ZnCO3]
Cerussite-[PbCO3]
Cassiterite-[SnO2]
Dolomite-[CaMg(CO3)2]