JEE Main 2026 · 8 Apr · Shift 2 · Chemistry Q54

ChemistrySingle correct+4 / -1Question 54 of 75

Which of the following statements are not correct ?

A. For water, magnitude of $K_b$ is more than the magnitude of $K_f$ .

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 $\ce{C6H5-C(=O)-OH\cdots O=C(OH)-C6H5}$

Choose the correct answer from the options given below :

A and B only

A and D only

A, B and D only

A, C and D only

Answer and worked solution

Official answer: C

Each statement.

A: For water $K_b=0.52$ and $K_f=1.86$ K kg mol⁻¹, so $K_b<K_f$ . Not correct.
B: For the same molality, $\Delta T_b<\Delta T_f$ . Not correct.
C: Osmotic pressure is preferred for proteins and polymers. Correct.
D: Benzoic acid dimerises in benzene through two hydrogen bonds (a cyclic dimer), not the single one drawn. Not correct.

Answer: A, B and D.

(C)

Topics:Colligative properties van't Hoff factor

JEE Main 2026 · 8 Apr · Shift 2, Chemistry question 54