(A) The important oxide ores of iron are Haematite $(Fe_2O_3)$ and Magnetite $(Fe_3O_4)$.$A$ is the correct option because Haematite is an oxide ore o

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(A) The important oxide ores of iron are Haematite $(Fe_2O_3)$ and Magnetite $(Fe_3O_4)$.$A$ is the correct option because Haematite is an oxide ore of iron.$B$ (Siderite) is $FeCO_3$ (carbonate ore).$C$ (Pyrites) is $FeS_2$ (sulphide ore).$D$ (Malachite) is $CuCO_3 \cdot Cu(OH)_2$ (copper ore).