Question

Limestone on heating decomposes into quick lime and carbon dioxide gas.What type of reaction is this?

• A. Endothermic Reaction.
• B. Thermal Decomposition.
• C. Endothermic and thermal decomposition reaction.
• D. Exothermic reaction.

Answer 1

The correct option is C

Endothermic and thermal decomposition reaction.

The reaction 'Limestone on heating decomposes into quick lime and carbon dioxide gas' can be represented as,

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

Heat is absorbed in the reaction, so it is an endothermic reaction. This is a decomposition reaction that involves heating so it is termed as thermal decomposition.