Relative lowering of vapour pressure is a colligative property because . (2024)

The correct option is B

It depends on the concentration of a non-electrolyte solute in a solution and does not depend on the nature of the solute molecules.

Colligative property

Colligative properties are those that depend on the number of solute particles irrespective of their nature.

Analysing the options :

(A)

See Also

Is Vapour pressure a colligative property?

Relative lowering of vapour pressure is a colligative property as Raoult’s observations established that the lowering of vapour pressure depends only on the concentration of the solute particles and is independent of their identity. Relative lowering of vapour pressure is proportional to the mole fraction of the solute.

See Also

Which of the following is colligative property?Colligative PropertiesA is true but R is falseWhich of the following statment is incorrect?

The vapour pressure of a solution decreases on the addition of a non-volatile solute and does not depend on the nature of the solute molecules. So, it is a correct statement.

(B)

When electrolytes are dissolved in solution, they are separated into ions. The lowering of vapour pressure does not depend on the nature of electrolyte itself, but on the number of ions. So, it is a correct statement.

As colligative properties are independent of the nature of the solute, options (C) and (D) are incorrect.

Hence, options (A) and (B) are the correct answers.