(a) Calamine (ZnCO3) and siderite (FeCO3) both are carbonates. (b) Argentite =Ag2S Culprite =Cu2O (c) Zinc blende =ZnS and pyrites =FeS2 are sulphide ares. (d) Malachite and azurite [Cu(OH)2.2CuCO3] are ores of copper. Hence, option (b) is incorrect.