The chemical formula of calcium hydroxide is :

A compound $\mathrm{X}$ has the following characteristics:
$\mathrm{a}.$ It is used as a disinfectant.
$\mathrm{b}.$ It is used to prepare bleaching powder.
$\mathrm{c}.$ Its suspension in water is called milk of lime.

Then compound $\mathrm{X}$ is

Describe an activity to show that the combination reaction between quicklime and water is an exothermic reaction. 

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by the liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is are true about slaking of lime and the solution formed?

(i) It is an endothermic reaction.

(ii) It is exothermic reaction.

(iii) The $\mathrm{pH}$ of the resulting solution will be more than seven.

(iv)The $\mathrm{pH}$ of the resulting solution will be less than seven.

Solid calcium oxide was taken in container and water was added slowly to it.

Write the observation.

Write the chemical formula of gypsum. How is it converted into plaster Of Paris? 

Solid calcium oxide was taken in a container and water was added slowly to it.

State two observations made in the experiment.

Solid calcium oxide was taken in container and water was added slowly to it.

Write the chemical formula of the products obtained.

Solid calcium oxide was taken in a container and water was added slowly to it.

Write the name and the chemical formula of the product.

Translate the following statements into chemical equation and then balance these
Calcium oxide reacts with water to give calcium hydroxide and release heat.

How would you obtain slaked lime from lime?

The question is modified as:

How would you obtain slaked lime from quicklime?

Classify the following reaction:

$\mathrm{CaO}\left(\mathrm{s}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\to \mathrm{Ca}\left(\mathrm{OH}{)}_2\right(\mathrm{aq})$