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(C) The primary ore of aluminum is bauxite $(Al_2O_3 \cdot 2H_2O)$.
Concentration of bauxite is carried out by the leaching process,specifically know

Vedclass · Accepted Answer

Bayer process

Vedclass · Answer

(C) The primary ore of aluminum is bauxite $(Al_2O_3 \cdot 2H_2O)$.
Concentration of bauxite is carried out by the leaching process,specifically known as the Bayer process.
In this process,the powdered ore is treated with a concentrated solution of $NaOH$ at $473-523 \ K$ and $35-36 \ 	ext{bar}$ pressure to dissolve the aluminum as sodium aluminate,leaving behind impurities like $Fe_2O_3$ and $SiO_2$.

$I$	$II$
$X$. Magnetic separation	$a$. $Ag_2S$
$Y$. Froth floatation	$b$. $FeCr_2O_4$
$Z$. Gravity separation	$c$. $Al_2(SiO_3)_3$

Which method is used for the concentration of aluminum ore?

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$I$ $II$

$X$. Magnetic separation $a$. $Ag_2S$

$Y$. Froth floatation $b$. $FeCr_2O_4$

$Z$. Gravity separation $c$. $Al_2(SiO_3)_3$

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