Rusting of an article made up of iron is called

$(a)$ State the difference between a pure substance and a mixture. Give one example of each.
$(b)$ Identify homogeneous mixtures from the following:
$(i)$ Smoke
$(ii)$ Brass
$(iii)$ Tincture of iodine
$(iv)$ Milk

What happens when
$(i)$ a saturated solution is heated?
$(ii)$ a saturated solution is cooled slowly?

Tincture of iodine has antiseptic properties. This solution is made by dissolving

$(a)$ Tabulate the differences between a suspension and a true solution with respect to $(i)$ filtration,$(ii)$ transparency,and $(iii)$ stability.
$(b)$ Give two examples from daily life where the Tyndall effect is observed.

$A$ solution contains $50 \, g$ of sugar in $350 \, g$ of water. Calculate the concentration of the solution in terms of mass by mass percentage of the solution. (in $\%$)