Auto reduction process is used in the extraction of
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a
Cu and Hg
b
Zn and Hg
c
Cu and Mg
d
Fe and Pb
answer is A.
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Detailed Solution
Auto reduction takes place in the case of Cu and Hg.The reactions are as follows:2HgS+3O2→2HgO+2SO22HgO+HgS→3Hg+SO22Cu2S+3O2→2Cu2O+2SO22Cu2O+Cu2S→6Cu+SO2