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.