The correct statements are :

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(D) Statement $(a)$ is incorrect because calcination and roasting are typically performed in a reverberatory furnace,not a blast furnace.Statement $(b

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Both $(b)$ and $(c)$.

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(D) Statement $(a)$ is incorrect because calcination and roasting are typically performed in a reverberatory furnace,not a blast furnace.Statement $(b)$ is correct; the impurities like sand,clay,or rocks present in the ore are known as gangue or matrix.Statement $(c)$ is correct; the froth floatation process is specifically used for the concentration of sulphide ores based on the preferential wetting of the ore particles by oil.Therefore,both $(b)$ and $(c)$ are correct statements.

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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