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The Impurities present in bauxite are

$ (a)\;\text{Sulphur, Silicone and Phosphorous.} \\(b)\;\text{Sulphur, Arsenic, and Phosphorous.} \\(c)\; \text{SiO2, iron oxide and titanium oxide.} \\ (d)\;\text{SiO2, zinc oxide and titanium oxide.} $
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The principal ore if aliminium, bauxite, usually contains $SiO_2$, iron oxide and titanium oxide as impurities.
Concentration is carried out by digesting the powdered ore with a concentrated solution $NaOH$ at $473 - 523\; K.$
Hence c is the correct answer.
answered Mar 20, 2014 by meena.p

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