Chemistry · Solutions and Colligative Properties

JEE Main 2026 — 8 April, Evening Shift — Question 46

Which of the following are not correct? A. For water, magnitude of $\mathrm{K}_{\mathrm{b}}$ is more than the magnitude of $\mathrm{K}_{\mathrm{f}}$ . B. The elevation in boiling point of water when a non-volative 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{C6H5COOH \cdots O=C(OH)C6H5}

Option A:
A and B only
Option B:
A and D only
Option C:
A, B and D only
Correct
Option D:
A, C and D only

Answer: C

Step-by-step solution

(A) $\mathrm{K}_{\mathrm{b}}$ for water $=0.512 \frac{{ }^{\circ} \mathrm{C}-\mathrm{Kg}}{\mathrm{mol}}$ $\mathrm{K}_{\mathrm{f}}$ for water $=1.86 \frac{{ }^{\circ} \mathrm{C}-\mathrm{Kg}}{\mathrm{mol}}$ So, $\mathrm{K}_{\mathrm{b}}<\mathrm{K}_{\mathrm{f}}$ for water (B) Since, $\mathrm{K}_{\mathrm{b}}<\mathrm{K}_{\mathrm{f}}$ so $\Delta \mathrm{T}_{\mathrm{b}}<\Delta \mathrm{T}_{\mathrm{f}}$ [same equimolal solution] (C) Osmotic pressure is used to determine molar mass of protiens & polymers (D) dimerised form of benzoic acid in benzene

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Exam: JEE Main 2026
Paper: 8 April, Evening Shift
Subject: Chemistry
Chapter: Solutions and Colligative Properties
Topic: Basics of Solutions

Given below are two statements: Given: Molar masses of C, H, O, Cl are 12, 1, 16, and 35.5 g mol^-1 , respectively. Statement I: In 30\%…

Answer: C

Step-by-step solution

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