Home › UP Board Class 12 › Ideal and Non-Ideal Solutions › Two solutions are said to be **isotonic** if they:
Two solutions are said to be **isotonic** if they:
AHave the same molality
BHave the same mole fraction of solute
CExert the same osmotic pressure at the same temperature
DHave the same vapour pressure
Answer & Solution
Correct answer: C. Exert the same osmotic pressure at the same temperature
Isotonic solutions are those that exert equal osmotic pressure at a given temperature; this implies equal molar concentration (and hence equal $iC$ if dissociation differs). Hypertonic and hypotonic refer to higher and lower osmotic pressure relative to a reference, respectively.
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