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Q.

The ore concentrated by electromagnetic separation is

I.wolframine 

II. haematite

III.cassiterite 

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a

I and II only 

b

I, II, and III 

c

II and III only

d

I and III only 

answer is D.

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Detailed Solution

detailed_solution_thumbnail
  • Iron ores are concentrated by electromagnetic separation. Because iron, Fe has magnetic nature.
  •  Ex: Wolframite, FeWO4 and Haemetite, Fe2O3 Casseterite SnO2
    also has iron impurity FeWO4.
    Hence, all these three Ores can be concentrated by electromagnetic separation.
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