JEE Advanced 2023 Paper 1 Q01 Chemistry Inorganic Chemistry Metallurgy Medium

JEE Advanced 2023 Paper 1 · Q01 · Metallurgy

The correct statement(s) related to processes involved in the extraction of metals is(are)

  1. A. Roasting of Malachite produces Cuprite.
  2. B. Calcination of Calamine produces Zincite.
  3. C. Copper pyrites is heated with silica in a reverberatory furnace to remove iron.
  4. D. Impure silver is treated with aqueous KCN in the presence of oxygen followed by reduction with zinc metal.
JEE Advanced multi-correct — pick every correct option, then check.
Reveal answer + step-by-step solution

Correct answer:B, C, D

Solution

(A) Malachite $CuCO_3 \cdot Cu(OH)_2$ on roasting/calcination gives $CuO$, not Cuprite ($Cu_2O$) — INCORRECT. (B) Calamine $ZnCO_3$ on calcination yields Zincite $ZnO + CO_2$ — CORRECT. (C) In the reverberatory furnace, $FeS$ in copper pyrites is converted to $FeO$ then removed as $FeSiO_3$ slag with silica — CORRECT. (D) MacArthur–Forrest process: impure $Ag + O_2 + KCN \to [Ag(CN)_2]^-$, then $Zn$ reduces it to silver metal — CORRECT.

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