Froth floatation process is used for the concentration of the ore of : (a) \( \mathrm{Fe} \) (b)...

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Froth floatation process is used for the concentration of the ore of :
(a) \( \mathrm{Fe} \)
(b) \( \mathrm{Al} \)
(c) \( \mathrm{Cr} \)
(d) \( \mathrm{Cu} \)
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