JEE Main · 2019 · 11 Jan 2019 · Shift 2 · General Principles and Processes of Isolation of Metals

The reaction that does NOT define calcination is:

(A) $Fe_{2} O_{3} . \times XH_{2} O Δ Fe_{2} O_{3} + XH_{2} O$
(B) $2 Cu_{2} S + 3 O_{2} ⟶ 2 Cu_{2} O + 2 SO_{2}$ ✓ Correct
(C) $ZnCO_{3} Δ ZnO + CO_{2}$
(D) $CaCO_{3} \cdot MgCO_{3} Δ CaO + MgO + 2 CO_{2}$

Answer: (B)

Solution

Calcination means heating an ore in the absence or limited supply of air to drive off volatile matter such as water or carbon dioxide. The steps that remove

H X_{2} O

CO X_{2}

by heating without air are calcinations, but the reaction of a copper sulphide with oxygen is heating in excess air — that is roasting, not calcination.

JEE Main · 2019 · 11 Jan 2019 · Shift 2 · Single correct option

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