Here are a few questions from fiitjee RSM whose answers i would like to verify as i am not too sure about them:
Single option correct:
1. extraction of Zn from Zns is done by
a)electrolytic reduction
b)roasting followed by reduction with C
c) roasting followed by reduction with another metal
d)roasting followed by self reduction
2. which ore contains both Fe and Cu
a)Cuprite
b)Chalcocite
c) Chalcopyrite
d)malachite
3.which process is used in metallurgy of Mg
a)fused salt electrolysis
b)self reduction
c)aq solution electrolysis
d)thermite reduction
Answers given are
1-c,2-a,3-b.
1Shouldn't the answers be 1-b,2-c and 3-c.
As far as i knew,
1. 2ZnS+3O2→2ZnO+2SO2,
ZnO+C→Zn+CO
are the reactions taking place in metallurgy of Zn.
2. Chalcopyrite or Copper pyrites(CuFeS2) should be the right answer for 2.
3. Dow's sea water process for extraction of Mg involves electrolysis of aq soln of MgCl2 alongwith NaCl which is added to increase the conductivity of the electrolyte.
