Solutions

Consider the following pairs of solution which will be isotonic at the same temperature. The number of pairs of solutions is / are ___________.

A. \(1 ~\mathrm{M}\) aq. \(\mathrm{NaCl}\) and \(2 ~\mathrm{M}\) aq. urea

B. \(1 ~\mathrm{M}\) aq. \(\mathrm{CaCl}_{2}\) and \(1.5 ~\mathrm{M}\) aq. \(\mathrm{KCl}\)

C. \(1.5 ~\mathrm{M}\) aq. \(\mathrm{AlCl}_{3}\) and \(2 ~\mathrm{M}\) aq. \(\mathrm{Na}_{2} \mathrm{SO}_{4}\)

D. \(2.5 ~\mathrm{M}\) aq. \(\mathrm{KCl}\) and \(1 ~\mathrm{M}\) aq. \(\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}\)