MetallurgyHard
Question
Out of Cu2S, HgS, Ag2S, PbS and ZnS, roasting will convert the minerals into metal in case of :
Options
A.Cu2S, PbS
B.HgS,ZnS
C.Cu2S, Ag2S
D.HgS,Cu2S.
Solution
If the sulphide ore of some of the less electropositive metals like Hg, Cu, Pb etc. are heated in air, a part of these is changed into oxide or sulphate that then reacts with the remaining part of the sulphide ore to give its metal and SO2.
2HgS + 3O2 → 2HgO + 2SO2 ; 2HgO + HgS → 2Hg + SO2
Cu2S + 3O2 → 3Cu2O + 2SO2 ; 2Cu2O + Cu2S → 6Cu + SO2
2PbS + 3O2 → 2PbO + 2SO2 ; 2PbO + PbS → 3Pb + SO2
2HgS + 3O2 → 2HgO + 2SO2 ; 2HgO + HgS → 2Hg + SO2
Cu2S + 3O2 → 3Cu2O + 2SO2 ; 2Cu2O + Cu2S → 6Cu + SO2
2PbS + 3O2 → 2PbO + 2SO2 ; 2PbO + PbS → 3Pb + SO2
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