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auto-reduction process is used in the extraction of a)Cu and Hg b)Zn and Hg c)Cu and Al d)Fe and Pb

auto-reduction process is used  in the extraction of
a)Cu and Hg
b)Zn and Hg
c)Cu and Al
d)Fe and Pb

Grade:11

2 Answers

Varon
510 Points
6 years ago
Hello christopher,
Oxides of metals less reactive than being less stable will undergo auto reduction
So Copper and Mercury will undergo auto reductiion
Raghulal Prajapati
76 Points
6 years ago
option (a) is correct .
 
explanation.:

Blast of air converts Cu2S partly into Cu2O which reacts with remaining Cu2S to give molten copper.
2Cu2 S + 3O2 → 2Cu2 O + 2SO2 
2Cu2O + Cu2 S → 6Cu + SO2 .           (self reduction)
and for Hg
th sulphide ore (cinnabar ) is heated in a current of air when the following rxn takes place.
2HgS + 3O2→2Hgo + 2SO2
2HgO + HgS→   3Hg + SO2     ( self reduction)

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