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Which colligative property is most suitable for determining the molar mass of macromolecules such as proteins?
ABoiling point elevation
BOsmotic pressure
CFreezing point depression
DVapour pressure lowering
Answer & Solution
Correct answer: B. Osmotic pressure
1. Macromolecules have very high molar mass, so molal concentrations are tiny.
2. ΔT_b and ΔT_f changes are then too small to measure reliably.
3. Osmotic pressure is measurable even at very low molar concentrations, making it the standard method.
_Source: Maharashtra Balbharati Std XII Chemistry, Ch 2 "Solutions" §2.9_
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