d- and f-Block Elements · JEE Advanced previous year questions

2023 1 question

1. Q352023 · 4 Jun 2023 · Paper 1· One or more correct

   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 $\mathrm{KCN}$ in the presence of oxygen followed by reduction with zinc metal.
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   Answer: B, C, D