JEE Advanced 2023 Chemistry question

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

(A)Roasting of Malachite produces Cuprite.
(B)Calcination of Calamine produces Zincite.Correct
(C)Copper pyrites is heated with silica in a reverberatory furnace to remove iron.Correct
(D)Impure silver is treated with aqueous KCN in the presence of oxygen followed by reduction with zinc metal.Correct

Answer: (B),(C),(D)

Solution

(A) Malachite on heating gives CuO, not cuprite () – wrong. (B) Calamine (zincite) – correct. (C) In the reverberatory furnace, silica

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Question ID VK-034096