Which of the following is colligative property

CONCEPT:

Colligative Properties

• Colligative properties are properties of solutions that depend on the number of solute particles, but not on their identity.
• Examples of colligative properties include:
  • Relative lowering of vapor pressure
  • Boiling point elevation
  • Freezing point depression
  • Osmotic pressure

EXPLANATION:

• Option 1: Relative Lowering in vapour pressure

  This is a colligative property because it depends on the number of solute particles in the solution relative to the solvent particles.

• Option 2: Lowering in vapour pressure

  This is not specifically a colligative property on its own as it refers to the absolute change in vapor pressure, which can depend on other factors besides the number of solute particles.

• Option 3: Vapour pressure

  This is not a colligative property because vapor pressure is an inherent property of the liquid and does not depend on the number of solute particles.

• Option 4: Saturated Pressure

  This is also not a colligative property; it refers to the pressure exerted by a vapor in thermodynamic equilibrium with its liquid at a given temperature.

Therefore, the colligative property among the given options is Option 1: Relative Lowering in vapour pressure.