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| Column-$I$ | Column-$II$ |
| $A$. $PbS \rightarrow PbO$ | $p$. भर्जन (roasting) |
| $B$. $CaCO_3 \rightarrow CaO$ | $q$. निस्तापन (calcination) |
| $C$. $ZnS \rightarrow Zn$ | $r$. कार्बन अपचयन (Carbon reduction) |
| $D$. $Cu_2S \rightarrow Cu$ | $s$. स्वतः अपचयन (self reduction) |
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