What happens when a hot saturated solution is cooled?

What happens when a saturated solution is heated?

Give an example for each of the following:
$(a)$ Solid-liquid homogeneous mixture
$(b)$ Gas-gas homogeneous mixture
$(c)$ Solid-solid homogeneous mixture
$(d)$ Solid-liquid heterogeneous mixture
$(e)$ Liquid-liquid heterogeneous mixture

How much water should be added to $15 \, g$ of salt to obtain a $15 \%$ salt solution (in $, g$)?

Which of the following is a homogeneous mixture?

Rusting of an article made up of iron is called