The chemical formulas of given ore in options are as follows Sphalerite ore: ZnS Calamine ore : ZnCO3 Siderite ore : FeCO3 Malachite ore : Cu(OH)2⋅CuCO3 Sphalerite ore containing ZnS is concentrated using group is cyanide salt ( NaCN ) as a depressant by froth flotation method.