Question:
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 C₆H₅-C-OH ⋯ O=C-C₆H₅
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 C₆H₅-C-OH ⋯ O=C-C₆H₅
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 C₆H₅-C-OH ⋯ O=C-C₆H₅
Updated On: Apr 13, 2026
- A and B only
- A and D only
- A, B and D only
- A, C and D only
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Colligative properties include $\Delta T_b$, $\Delta T_f$, and $\pi$. Constants $K_b$ and $K_f$ are solvent-specific.
Step 2: Detailed Explanation:
Statement A: For water, $K_b = 0.52 \text{ K kg mol}^{-1}$ and $K_f = 1.86 \text{ K kg mol}^{-1}$. Thus, $K_f>K_b$. Statement A is Incorrect. Statement B: Since $\Delta T_b = K_b \cdot m$ and $\Delta T_f = K_f \cdot m$, and $K_f>K_b$, the magnitude of depression in freezing point is larger than the elevation in boiling point. Statement B is Incorrect. Statement C: This is Correct. Osmotic pressure is measured at room temperature and the values are larger and easier to measure for macromolecules. Statement D: Benzoic acid dimers form via two hydrogen bonds involving both oxygen atoms of the carboxyl group. The structure shown in D is incomplete/incorrectly represented as a simple chain. Statement D is Incorrect.
Step 3: Final Answer:
Statements A, B, and D are not correct.
Colligative properties include $\Delta T_b$, $\Delta T_f$, and $\pi$. Constants $K_b$ and $K_f$ are solvent-specific.
Step 2: Detailed Explanation:
Statement A: For water, $K_b = 0.52 \text{ K kg mol}^{-1}$ and $K_f = 1.86 \text{ K kg mol}^{-1}$. Thus, $K_f>K_b$. Statement A is Incorrect. Statement B: Since $\Delta T_b = K_b \cdot m$ and $\Delta T_f = K_f \cdot m$, and $K_f>K_b$, the magnitude of depression in freezing point is larger than the elevation in boiling point. Statement B is Incorrect. Statement C: This is Correct. Osmotic pressure is measured at room temperature and the values are larger and easier to measure for macromolecules. Statement D: Benzoic acid dimers form via two hydrogen bonds involving both oxygen atoms of the carboxyl group. The structure shown in D is incomplete/incorrectly represented as a simple chain. Statement D is Incorrect.
Step 3: Final Answer:
Statements A, B, and D are not correct.
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