In which of the following metallurgy,self-red | vedclass

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(A) Self-reduction (or auto-reduction) is a process where the metal sulfide is partially roasted to form oxide,which then reacts with the remaining su

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$ZnS 	o Zn$

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(A) Self-reduction (or auto-reduction) is a process where the metal sulfide is partially roasted to form oxide,which then reacts with the remaining sulfide to produce the metal.$1. PbS$ (Galena) undergoes self-reduction: $2PbS + 3O_2 	o 2PbO + 2SO_2$ followed by $PbS + 2PbO 	o 3Pb + SO_2$.$2. Cu_2S$ (Copper glance) undergoes self-reduction: $2Cu_2S + 3O_2 	o 2Cu_2O + 2SO_2$ followed by $2Cu_2O + Cu_2S 	o 6Cu + SO_2$.$3. HgS$ (Cinnabar) undergoes self-reduction: $2HgS + 3O_2 	o 2HgO + 2SO_2$ followed by $2HgO + HgS 	o 3Hg + SO_2$.$4. ZnS$ (Zinc blende) cannot be reduced by self-reduction because zinc oxide $(ZnO)$ is not easily reduced by $ZnS$. Instead,$ZnO$ is reduced by carbon $(C)$ in a blast furnace.Therefore,self-reduction is not possible for $ZnS 	o Zn$.

In which of the following metallurgy,self-reduction is not possible?

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