Question

Which of the following reactions represents calcination?
(a) $2Ag + 2HCl + [O] \rightarrow 2AgCl + H_2O$
(b) $2Zn + O_2 \rightarrow 2ZnO$
(c) $2ZnS + 3O_2 \rightarrow 2ZnO + 2SO_2$
(d) $MgCO_3 \rightarrow MgO + CO_2$

Answer 1

Calcination refers to the chemical process in which a carbonate ore of a metal is strongly heated in the limited supply (or lack) of Oxygen (air).

Thus, option (d) is the correct answer.

   MgCO₃ (s) + heat → MgO (s) + CO₂ (g)

      The above reaction occurs in the lack of Oxygen, during heating.

Answer 2

$MgCO_3\rightarrow MgO+CO_2$ represents calcination.

Explanation:

Calcination is process of converting an ore into its oxide by heating either in a limited supply or in absence of air.

$MgCO_3\rightarrow MgO+CO_2$

Roasting is the process of heating of sulphide ores in the presence of oxygen.

$2ZnS+3O_2\rightarrow 2ZnO+2SO_2$

Oxidation is the process of converting metals into their ores by heating with oxygen.

$2Zn+O_2\rightarrow 2ZnO$

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