First slide

General methods of extraction of elements from the earth crust

Question

Which of the following reactions occur during calcination?

Moderate

A

CaCO₃ â CaO + CO₂
B

$2 Al (OH)_{3} â¶ {Al}_{2} O_{3} + 3 H_{2} O$
C

$4 {FeS}_{2} + 11 O_{2} â¶ 2 {Fe}_{2} O_{3} + 8 {SO}_{2}$
D

${Cu}_{2} S + 2 CuO â¶ 4 Cu + {SO}_{2}$

Solution

Reactions (1) and (2) represent calcination process, whereas (3) is roasting as reduction is done by heating in presence of O₂and (4) is auto-reduction process.

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