Question

Which of the following is not a colligative property?

• A. $\Delta T_f$
• B. $\pi$
• C. $\Delta T_b$
• D. $K_b$

Answer 1

Answer: (D)

The colligative properties are those which depend on number of particles but not on their nature.
$\Delta T_f$ (depression in freezing point),
$\pi$ (osmotic pressure),
$\Delta T_b$ (elevation in boiling point)
are colligative properties.
$K_b$ is molal elevation constant and it is not colligative property.