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