Which of the following reactions is a part of | vedclass

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(A) The Bayer's process is used for the purification of bauxite ore $(Al_2O_3 \cdot 2H_2O)$.In this process,the powdered bauxite ore is digested with

Vedclass · Accepted Answer

$Al_2O_3 + 2NaOH \rightarrow 2NaAlO_2 + H_2O$

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(A) The Bayer's process is used for the purification of bauxite ore $(Al_2O_3 \cdot 2H_2O)$.In this process,the powdered bauxite ore is digested with a concentrated solution of $NaOH$ at $473-523 \ K$ and $35-36 \ 	ext{bar}$ pressure.This results in the formation of soluble sodium aluminate $(NaAlO_2)$:$Al_2O_3(s) + 2NaOH(aq) + 3H_2O(l) ightarrow 2Na[Al(OH)_4](aq)$ or simply $Al_2O_3 + 2NaOH ightarrow 2NaAlO_2 + H_2O$.

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

Which of the following reactions is a part of the Bayer's process for the extraction of aluminum?

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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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