Question

Which observation(s) reflect(s) colligative properties?
(i) a 0.5 m NaBr solution has a higher vapour pressure than a 0.5 m BaCl₂ solution at the same temperature
(ii) pure water freezes at the higher temperature than pure methanol
(iii) a 0.1 m NaOH solution freezes at a lower temperature than pure water

Choose the correct answer from the codes given below
(a) (i), (ii) and (iii)
(b) (i) and (ii)
(c) (ii) and (iii)
(d) (i) and (iii)

Answer 1

Both the options (1) and (3) are colligative properties

• Colligative properties depends on the ratio of number of solute particles to the solvent particles in a solution

• Colligative properties include freezing point depression, osmotic pressure, vapor pressure lowering, and boiling point elevation.

• Colligative properties also depends upon the number of particles in the solution

• Methanol is a non-electrolyte which cannot be considered as colligative property