MetallurgyHard
Question
Consider the following statements :
S1 : In electrolytic refining, the impurities from the blister copper deposits anode mud which contains antimony, selenium, tellurium, silver, gold and platinum. (From copper pyrites)
S2 : In Serpeck’s process silica is removed by heating the bauxite to 1800oC with coke in a current of N2 .
S3 : Chalcocite and azurite are ores of copper.
S4 : The tin is obtained by the carbon reduction of black tin.
and arrange in the order of true/false
S1 : In electrolytic refining, the impurities from the blister copper deposits anode mud which contains antimony, selenium, tellurium, silver, gold and platinum. (From copper pyrites)
S2 : In Serpeck’s process silica is removed by heating the bauxite to 1800oC with coke in a current of N2 .
S3 : Chalcocite and azurite are ores of copper.
S4 : The tin is obtained by the carbon reduction of black tin.
and arrange in the order of true/false
Options
A.T F T T
B.F T F F
C.F F T T
D.T T T T
Solution
S1 : The mud obtained below the anode contains unreactive Sb, Se, Te, Ag, Au and Pt.
S2 : SiO2 + 2C
Si ↑+ 2CO↑ (Serpeck′s method)
At this temperature silicon is volatile.
S3 : Chalco pyrite is CuFeS2 and azurite is 2CuCO3.Cu(OH)2.
S4 : Purified cassiterite ore containg 60 -70% SnO2 is called black tin.
SnO2 (black tin) + 2C → Sn + 2CO (carbon reduction).
S2 : SiO2 + 2C
Si ↑+ 2CO↑ (Serpeck′s method)At this temperature silicon is volatile.
S3 : Chalco pyrite is CuFeS2 and azurite is 2CuCO3.Cu(OH)2.
S4 : Purified cassiterite ore containg 60 -70% SnO2 is called black tin.
SnO2 (black tin) + 2C → Sn + 2CO (carbon reduction).
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