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JEE Advanced · 2019 · 27 May 2019 · Paper 1 · General Principles and Processes of Isolation of Metals

Calamine, malachite, magnetite and cryolite, respectively are

(A) $ZnSO_{4}, CuCO_{3}, Fe_{2} O_{3}, AlF_{3}$
(B) $ZnCO_{3}, CuCO_{3} . Cu (OH)_{2}, Fe_{3} O_{4}, Na_{3} AlF_{6}$ ✓ Correct
(C) $ZnSO_{4}, Cu (OH)_{2}, Fe_{3} O_{4}, Na_{3} AlF_{6}$
(D) $ZnCO_{3}, CuCO_{3}, Fe_{2} O_{3}, Na_{3} AlF_{6}$

Answer: (B)

Solution

The correct chemical formulae of the named ores are:

Calamine: $ZnCO_{3}$ (zinc carbonate)
Malachite: $CuCO_{3} \cdot Cu (OH)_{2}$ (basic copper carbonate)
Magnetite: $Fe_{3} O_{4}$ (mixed oxide of iron)
Cryolite: $Na_{3} AlF_{6}$ (sodium aluminum fluoride)

Option (B) correctly lists all four.

JEE Advanced · 2019 · 27 May 2019 · Paper 1 · Single correct option

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