Extraction of lead by reduction methods is do | vedclass

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(D) The extraction of lead from its principal ore,galena $(PbS)$,involves a process known as self-reduction or auto-reduction. In the reverberatory fu

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Self-reduction of oxide from sulphide present in the furnace

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(D) The extraction of lead from its principal ore,galena $(PbS)$,involves a process known as self-reduction or auto-reduction. In the reverberatory furnace,the ore is partially roasted in air to convert some $PbS$ into $PbO$ and $PbSO_4$: $2PbS + 3O_2 \rightarrow 2PbO + 2SO_2$ $PbS + 2O_2 \rightarrow PbSO_4$ After partial roasting,the air supply is cut off,and the temperature is raised. The remaining $PbS$ reacts with the $PbO$ and $PbSO_4$ formed to produce metallic lead: $PbS + 2PbO \rightarrow 3Pb + SO_2$ $PbS + PbSO_4 \rightarrow 2Pb + 2SO_2$ This process is called self-reduction.

$(I)$ (process)	$(II)$ (electrolyte)
$(i)$. Downs cell	$(W)$. fused $MgCl_2$
$(ii)$. Dow sea water process	$(X)$. fused $(Al_2O_3 + Na_3AlF_6)$
$(iii)$. Hall-Heroult	$(Y)$. fused $KHF_2$
$(iv)$. Moissan	$(Z)$. fused $(40\% NaCl + 60\% CaCl_2)$

Extraction of lead by reduction methods is done by

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