Question

Out of the following solutions, the one having the highest boiling point will be:

Options

• 0.1 M NaCl

• 0.1 M BaCl₂

• 0.1 M KNO₃

• 0.1 M K₄Fe(CN)₆

Answer 1

0.1 M K₄Fe(CN)₆

Explanation:

Boiling point elevation is a colligative property and depends on the number of ions (van’t Hoff factor, i). K₄Fe(CN)₆ dissociates into 5 ions (4K⁺ and 1 \[\ce{Fe(CN){^{4−}_{6}}}\]), which is more than the others. Hence, it causes the greatest boiling point elevation.