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← IIT-JEE 2008 · Paper 2
ChemistryMatrix match+6Question 65 of 66

IIT-JEE 2008 · Paper 2, Chemistry question 65

Match the conversions in Column I with the type(s) of reaction(s) given in Column II. Indicate your answer by darkening the appropriate bubbles of the 4 × 4 matrix given in the ORS.

Column I

  • A
    PbS→PbO\ce{PbS -> PbO}
  • B
    CaCOX3→CaO\ce{CaCO3 -> CaO}
  • C
    ZnS→Zn\ce{ZnS -> Zn}
  • D
    CuX2S→Cu\ce{Cu2S -> Cu}

Column II

  • P
    roasting
  • Q
    calcination
  • R
    carbon reduction
  • S
    self reduction
Mark every match for each entry
PQRS
A
B
C
D
Answer and worked solution

Official answer: A → P; B → Q; C → P, R; D → P, S

  • A, PbS → PbO. Heating a sulphide ore in air: roasting. → P.
  • B, CaCO₃ → CaO. Heating a carbonate to drive off COX2\ce{CO2}: calcination. → Q.
  • C, ZnS → Zn. Roasting to ZnO, then reduction of ZnO with carbon (coke). → P, R.
  • D, Cu₂S → Cu. Partial roasting to CuX2O\ce{Cu2O}, then CuX2S+2 CuX2O→6 Cu+SOX2\ce{Cu2S + 2Cu2O -> 6Cu + SO2}: self-reduction. → P, S.

Answer: A → P; B → Q; C → P, R; D → P, S

Topics:Extraction and thermodynamics (Ellingham)Extraction of specific metals
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