In which mode of expression, the concentration of a solution remains independent of temperature?

Solution :
TIPS/Formulae :
(i) Volume of substance changes with temperature and mass is not effected by change in temperature.
(ii) Find expression which does not have volume term in it.
(A) Molarity — Moles of solute/volume of solution in $$L$$
(B) Normality — gm equivalents of solute/volume of solution in $$L.$$
(C) Formality—gm formula wt./volume of solution in $$L.$$
(D) Molality — Moles of solute/mass of solvent in $$kg$$
$$\because $$ Molality does not involve volume term.
$$\therefore $$  It is independent of temperature.