Which of the following are not correct ?
A. For water, magnitude of Kb is more than the magnitude of Kf.
B. The elevation in boiling point of water when a non-volatile solute is added to it is larger in magnitude than its depression in freezing point.
C. Osmotic pressure measurement is preferred over any other colligative property to determine molar mass of proteins and polymers.
D. The dimerised form of benzoic acid in benzene is C₆H₅—C(=O)—OH .... O=C(OH)—C₆H₅.
(A) Kb for water = 0.512 °C–Kg/mol Kf for water = 1.86 °C–Kg/mol So, Kb < Kf for water.
(B) Since Kb < Kf so ΔTb < ΔTf [same equimolal solution]
(C) Osmotic pressure is used to determine molar mass of proteins & polymers.
(D) Benzoic acid exists as hydrogen-bonded dimer in benzene, so the given structure is incorrect.
Therefore, option (A), (B) & (D) are incorrect.
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