First slide

General methods of extraction of elements from the earth crust

Question

Which of the following are examples of calcination?

Moderate

A

${CuCO}_{3} \cdot Cu (OH)_{2} ⟶ 2 CuO + {CO}_{2} + H_{2}$
B

$2 Ag + HCl + [O] ⟶ 2 AgCl + H_{2} O$
C

${CaCO}_{3} ⟶ CaO + {CO}_{2}$
D

$2 ZnS + 3 O_{2} ⟶ 2 Zn + 2 {SO}_{2}$

Solution

During calcination volatile impurities are removed and carbonate ores decompose to give oxides.

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