Question

In the calcination process, the type of reaction taking place is _____ .

• A. combustion
• B. redox
• C. decomposition
• D. displacement

Answer 1

The correct option is C decomposition

Generally, in the calcination process, a carbonate ore is heated in the absence of air to break the ore down into its corresponding metal oxide. The operation that takes place is decomposition.

$\text{Metal carbonate}\to \text{Metal oxide}+{\text{CO}}_2$

$CaC{O}_3\left(s\right)\stackrel{\Delta }{\to }CaO\left(s\right)+C{O}_2\left(g\right)\uparrow$

The above reaction is not redox because there is no change in the oxidation states of any of the elements. Combustion is a reaction where a fuel (carbon-based) burns in the presence of oxygen to give water vapour, energy and carbon dioxide.