The aqueous solution having osmotic pressure nearest to that of an equimolar solution of ${\mathrm{K}}_4\left[\mathrm{Fe}\right(\mathrm{CN}{)}_6]$ is:

The elevation in the boiling point of a solution containing $13.44 \mathrm{g}$ of ${\mathrm{CuCl}}_2$ in $1 \mathrm{kg}$ of water is

$({\mathrm{K}}_{\mathrm{b}}=0.52 \mathrm{K} \mathrm{kg} {\mathrm{mol}}^{–1})$

Which of the following observation indicates colligative property?

$\mathrm{I}.$ A $0.5 \mathrm{M} \mathrm{NaBr}$ solution has a higher vapour pressure than $0.5 \mathrm{M} {\mathrm{BaCl}}_2$.

$\mathrm{II}.$ A $0.5 \mathrm{M} \mathrm{NaOH}$ solution freezes at a lower temperature than pure water.

$\mathrm{III}.$ Pure water freezes at a higher temperature than pure ethanol.

Colligative properties have many practical uses, some of them may be:

I: Melting of snow by salt.

II: Desalination of seawater.

III: Determination of molar mass.

IV: Determination of melting point and boiling point of solvent actual practical uses are: