Which of the following statements is correct?

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(A) In the leaching of bauxite $(Al_2O_3 \cdot 2H_2O)$,the ore contains impurities like $SiO_2$,$Fe_2O_3$,and $TiO_2$. When treated with concentrated

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Leaching of bauxite using concentrated $NaOH$ solution gives sodium aluminate and sodium silicate.

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(A) In the leaching of bauxite $(Al_2O_3 \cdot 2H_2O)$,the ore contains impurities like $SiO_2$,$Fe_2O_3$,and $TiO_2$. When treated with concentrated $NaOH$ solution,$Al_2O_3$ dissolves to form sodium aluminate $(Na[Al(OH)_4])$ and $SiO_2$ dissolves to form sodium silicate $(Na_2SiO_3)$. Thus,option $A$ is correct. Option $B$ is incorrect because the Hall-Heroult process is used only for aluminium. Option $C$ is incorrect because the blistered appearance of copper is due to the evolution of $SO_2$ gas,not $CO_2$. Option $D$ is incorrect because cast iron is obtained from pig iron.

Column-$I$	Column-$II$
$A$. $PbS \rightarrow PbO$	$p$. roasting
$B$. $CaCO_3 \rightarrow CaO$	$q$. calcination
$C$. $ZnS \rightarrow Zn$	$r$. Carbon reduction
$D$. $Cu_2S \rightarrow Cu$	$s$. self reduction

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