Quicklime is represented by the formula

 Quick lime is a crystalline solid at room temperature. The properties of quick lime are as follows: It is a white, caustic, and alkaline compound. Quick lime is prepared by the thermal decomposition of limestone.

Quick lime is also known as burnt lime or calcium oxide

Preparation of quick lime is as follows:

${\mathrm{CaCO}}_{3\left(\mathrm{s}\right)}\to {\mathrm{CaO}}_{\left(\mathrm{S}\right)}+{\mathrm{CO}}_2$