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Match the conversions in Column-$I$ with the type$(s)$ of reaction$(s)$ given in Column-$II$.
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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In the electrolysis of $Al_2O_3$ by the Hall-Heroult process,which of the following statements is correct?

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