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Magnetic separation can be used to conce...

Magnetic separation can be used to concentrate
(a)(Ore+Impurity S n O 2 + F e W O 4
(a)Ore+Impurity S n O 2 + M n W O 4
(c)Ore+Impurity F e C r 2 O 4 + S i O 2
All of these

A

`{:("Ore+Impurity"),(SnO_(2)+FeWO_(4)):}`

B

`{:("Ore+Impurity"),(SnO_(2)+MnWO_(4)):}`

C

`{:("Ore+Impurity"),(FeCr_(2)O_(4)+SiO_(2)):}`

D

All of these

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