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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 preparation of Co, Hg and Pb etc. which are less electropositive metal e.g.,
2HgS + 3O2 --> 2HgO + 2SO2
2HgO + HgS --> 3Hg + SO2
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