The ore which is concentrated by leaching is:

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(B) Leaching involves the treatment of the ore with a suitable reagent to make it soluble while impurities remain insoluble. After this,the ore is rec

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$Al_2O_3 \cdot 2H_2O$

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(B) Leaching involves the treatment of the ore with a suitable reagent to make it soluble while impurities remain insoluble. After this,the ore is recovered from the solution by suitable methods.The principal ore of aluminium,bauxite $(Al_2O_3 \cdot 2H_2O)$,usually contains $SiO_2$,iron oxides,and titanium oxides as impurities.$Al_2O_{3(s)} + 2NaOH_{(aq)} + 3H_2O_{(l)} \rightarrow 2Na[Al(OH)_4]_{(aq)}$$2Na[Al(OH)_4]_{(aq)} + CO_{2(g)} \rightarrow Al_2O_3 \cdot xH_2O_{(s)} + 2NaHCO_{3(aq)}$The sodium silicate remains in the solution,and hydrated alumina is filtered,dried,and heated to give pure $Al_2O_3$.$Al_2O_3 \cdot xH_2O_{(s)} \xrightarrow{1470 \ K} Al_2O_{3(s)} + xH_2O_{(g)}$

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