Select the incorrect statement.

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(B) $1$. Cerrusite is $PbCO_3$ (a carbonate ore),which is concentrated by gravity separation or froth floatation,but it is not the primary method. How

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Roasting process is involved for extraction of iron.

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(B) $1$. Cerrusite is $PbCO_3$ (a carbonate ore),which is concentrated by gravity separation or froth floatation,but it is not the primary method. However,statement $A$ is generally considered acceptable in some contexts. $2$. In the extraction of iron,the process involves calcination and smelting in a blast furnace,not roasting. Roasting is typically used for sulfide ores. Thus,statement $B$ is incorrect. $3$. Serpeck's process is used for the purification of bauxite $(Al_2O_3)$. The byproduct is $AlN$ (Aluminum Nitride),not silicon. Thus,statement $C$ is also incorrect. $4$. Cassiterite $(SnO_2)$ and Rutile $(TiO_2)$ are indeed oxide ores. Given the standard curriculum,both $B$ and $C$ contain inaccuracies,but $B$ is a fundamental error regarding iron metallurgy.

List-$I$ (Substances)	List-$II$ (Processes)
$A$. Sulphuric acid	$i$. Haber's process
$B$. Steel	$ii$. Bessemer's process
$C$. Sodium hydroxide	$iii$. Leblanc process
$D$. Ammonia	$iv$. Contact process

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

Column $I$	Column $II$
$A$. Cyanide process	$i$. Ultrapure $Ge$
$B$. Froth floatation	$ii$. Dressing of $ZnS$
$C$. Electrolytic reduction	$iii$. Extraction of $Al$
$D$. Zone refining	$iv$. Extraction of $Au$
	$v$. Purification of $Ni$

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