Question

Give two examples for each of the following:

$\left(e\right)$. Efflorescent substances

Answer 1

Efflorescent substance is a chemical which has water associated with its molecules, and which, when exposed to air, loses this water through evaporation.

The two examples of Efflorescent substances are
$\left(i\right)$ Washing soda $(N{a}_{2}C{O}_3\cdot 10H_{2}O)$
$\left(ii\right)$ Glauber’s salt $(N{a}_{2}S{O}_4\cdot 10H_{2}O)$