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Question

A and B are two ores of copper.
A undergoes calcination to form a solid, CO2(g) and O2(g)
B undergoes roasting to form a solid and a gas C which turns acidified K2Cr2O7 to green solution.
B also reacts with dil HCl to form a solid and gas D which turns lead acetate solution black. D also reacts with C to form colloidal sulphur in the presence of moisture.

The copper ores A and B respectively are:
  1. Carbonate and hydroxide
  2. Carbonate and oxide
  3. Carbonate and sulphide
  4. Sulphide and carbonate


Solution

The correct option is C Carbonate and sulphide
A = Cu(CO3) and B = CuS

Reactions involved are:

Calcination of A:
Cu(CO3)(A)CuO(solid)+CO2+O2

Roasting of B:
CuS(B)CuO(solid)+SO2(C)

SO2(C)+K2Cr2O7K2(SO)4+Cr3+(green)

CuS(B)+dil.HClCuCl2(solid)+H2S(D)

H2S(D)+Pb2+PbS(black)

H2S(D)+SO2(C)(moisture) Colloidal sulphur   

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