(C) The chemical formulas for the given ores are as follows:Dolomite$MgCO_3 \cdot CaCO_3$Magnesite$MgCO_3$Carnallite$KCl \cdot MgCl_2 \cdot 6H_2O$As o

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(C) The chemical formulas for the given ores are as follows:Dolomite$MgCO_3 \cdot CaCO_3$Magnesite$MgCO_3$Carnallite$KCl \cdot MgCl_2 \cdot 6H_2O$As observed from the formulas,magnesium $(Mg)$ is present in all three ores. Therefore,$Mg$ is the metal that can be extracted from all of them.