Which of the following metal's ore can be concentrated by magnetic separation method?

Iron

The correct answer is Option (3) → Iron

The ore of iron can be concentrated by the magnetic separation method. Magnetic separation is used when either the ore or the gangue is magnetic. In the case of iron ores such as magnetite, the ore particles are magnetic and can be easily separated from non-magnetic impurities using a magnetic field.

Option (1) → Aluminium-  Aluminium ores are not concentrated by magnetic separation.The main ore of aluminium is bauxite, which is non-magnetic. It is purified by the leaching method (Bayer’s process).

Option (2) → Cadmium- Cadmium ores are not concentrated by magnetic separation. Cadmium generally occurs along with zinc ores and is separated during metallurgical processes rather than by magnetic methods.

Option (4) → Zinc -  Zinc ores are not concentrated by magnetic separation. Zinc ores such as zinc blende (ZnS) are usually concentrated by the froth flotation method, not by magnetic separation.