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

Vedclass · Accepted Answer

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

Vedclass · Answer

(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.

List-$I$	List-$II$
$(a)$ van Arkel method	$1$. Manufacture of caustic soda
$(b)$ Solvay process	$2$. Purification of titanium
$(c)$ Cupellation	$3$. Manufacture of $Na_2CO_3$
$(d)$ Poling	$4$. Purification of copper
$ $	$5$. Refining of silver

List-$I$	List-$II$
$(P) \ PbS + 2PbO \xrightarrow{\Delta} 3Pb + SO_2 \uparrow$	$(1) \ \text{Smelting}$
$(Q) \ PbS + \frac{3}{2}O_2 \xrightarrow{\Delta} PbO + SO_2 \uparrow$	$(2) \ \text{Self reduction}$
$(R) \ PbCO_3 \xrightarrow{\Delta} PbO + CO_2 \uparrow$	$(3) \ \text{Calcination}$
$(S) \ PbO + C \xrightarrow{\Delta} Pb + CO \uparrow$	$(4) \ \text{Roasting}$

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