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Find the number of ores which can be concentrated by magnetic separation method. `Fe_(2)O_(3), Fe_(3)O_(4), FeCO_(3), FeS_(2), CuFeS_(2), Cu_(2)O, ZnS

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Find the number of ores which can be concentrated by magnetic separation method.
`Fe_(2)O_(3), Fe_(3)O_(4), FeCO_(3), FeS_(2), CuFeS_(2), Cu_(2)O, ZnS, ZnCO_(3), ZnO`
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Correct Answer - 4
`Fe_(2)O_(3),Fe_(3)O_(4),FeCO_(3),FeS_(2)`
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