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(B) Isotonic solutions are defined as solutions having the same osmotic pressure at a given temperature. Since $\pi = CRT$,if $\pi$ is the same,the mo

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They have the same weight concentrations.

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(B) Isotonic solutions are defined as solutions having the same osmotic pressure at a given temperature. Since $\pi = CRT$,if $\pi$ is the same,the molar concentrations $(C)$ must be the same,not necessarily the weight concentrations. When two solutions are isotonic,there is no net flow of solvent across a semipermeable membrane,meaning osmosis does not occur. However,having the same osmotic pressure does not imply that the solutions have the same vapour pressure,as vapour pressure depends on the mole fraction of the solvent,which may differ depending on the nature of the solutes.

Which of the following statements regarding isotonic solutions is $NOT$ correct?

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