Find the number of ores which can be con...

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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The correct Answer is:

4

`Fe_(2)O_(3),Fe_(3)O_(4),FeCO_(3),FeS_(2)`

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