Verified Solution • 2025–26 Session moderate

QJEEAdv08Ch87b6: JEE Advanced 2008 Chemistry - Class 12 JEEAdv08Ch87b6 Solution: Match the conversions in Column I with the type(s) of…

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 ×\times 4 matrix given in the ORS.

Column I Column II
(A) PbS →\to PbO (P) roasting
(B) CaCO 3_3 →\to CaO (Q) Calcination
(C) ZnS →\to Zn (R) carbon reduction
(D) Cu 2_2 S →\to Cu (S) self reduction

Multiple Choice Options

  • A A →\to (p); B →\to (q); C →\to (p); D →\to (s)
  • B A →\to (q); B →\to (p); C →\to (r); D →\to (p, s)
  • C A →\to (p); B →\to (q); C →\to (p, r); D →\to (p, s)
  • D A →\to (p); B →\to (q, s); C →\to (p, r); D →\to (p)

Step-by-Step Verified Solution

A. For PbS →\to O 2_2 PbO, roasting is done.

B. For CaCO 3_3 →\to CaO, calcinations is done in the absence of air.

C. For ZnS →\to Zn, there is roasting is followed by reduction

2ZnS + 3O 2_2 ⟶Δ 2ZnO + 2SO 2_2 ↑\uparrow

2ZnSO 4_4 ⟶Δ ZnO + SO 2_2 + 12\frac{1}{2} O 2_2 ↑\uparrow

ZnO ⟶Δ Zn + CO ↑\uparrow

D. For Cu 2_2 S →\to Cu, roasting is done followed by self-reduction.

2Cu 2_2 S + 3O 2_2 →\to 2Cu 2_2 O + 2SO 2_2

Cu 2_2 S + 2Cu 2_2 O →\to 6Cu + SO 2_2

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