JEE Main 2021 · 1 September · evening · Single correct · +4 / −1

Calamine and Malachite, respectively, are the ores of :

  1. (a) Nickel and Aluminium
  2. (b) Zinc and Copper
  3. (c) Copper and Iron
  4. (d) Aluminium and Zinc
Answer and solution

Answer (b) Zinc and Copper

Solution

Chemistry ma’am · 3 steps

Both are carbonate ores, so just recall the formula: calamine is ZnCO3, malachite is the green copper one.

  1. Calamine. Calamine is zinc carbonate, ZnCO₃. It is the carbonate ore of zinc.
  2. Malachite. Malachite is basic copper carbonate, CuCO₃.Cu(OH)₂. Its bright green colour comes from the Cu²⁺ ion, so it is an ore of copper.
    OreFormulaMetal
    CalamineZnCO₃Zinc
    MalachiteCuCO₃.Cu(OH)₂Copper
    SideriteFeCO₃Iron
    BauxiteAlOₓ(OH)₃₋₂ₓAluminium
  3. So. In the order asked, calamine and malachite are ores of zinc and copper, which is option (b).

The idea to keep. Learn ores in families by anion. The common carbonate ores are calamine (Zn), malachite and azurite (Cu) and siderite (Fe).

Answer from the NTA final answer key. Solution by PrepWiser.

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Asked about 80 times in JEE Main since 2020. This question is from 2021.