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प्रश्न
Which of the following ores is not concentrated by electromagnetic method?
विकल्प
Haematite
Wolframite
Casseterite
Galena
MCQ
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उत्तर
Galena
Explanation:
The electromagnetic (magnetic separation) method is used for concentrating ores in which one component (ore or impurity) is magnetic and the other is non-magnetic. Haematite (Fe2O3), Wolframite (FeWO4 . MnWO4), and Cassiterite (SnO₂) are concentrated by this method because they contain magnetic impurities. Galena (PbS) is non-magnetic, so it cannot be concentrated by electromagnetic separation.
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