Question

What do you observe? When ​
(f) Water is added to the quick lime.​

Answer 1

When quick lime $\left(CaO\right)$ is dissolved in water $\left(H_{2}O\right)$, heat is released and slaked lime $\left[Ca\right(OH{)}_2]$ is formed. It is a chemical change. It can be shown by chemically as,
$CaO+H_{2}O\to Ca(OH{)}_2+\text{Heat}$