(i) solute

(ii) density

(iii) elevation in boiling point

(iv) depression in freezing point

Correct Answers:

(iii) elevation in boiling point

(iv) depression in freezing point

Explanation: Isotonic solutions have the same osmotic pressure and the same concentration. The increase of the boiling point and the depression in the freezing point are both intertwined. The two colligative properties depend on the concentration of the solution. Since molar concentration is similar to isotonic solutions, so the lift in the boiling area and the depression in the freezing zone of isotonic solutions should be the same.