Several interesting observations from the world around you are listed below. Which of these is NOT explained by a colligative property?

1. A lobster will die when placed in fresh water.
2. At high altitude it takes longer to cook spaghetti.
3. Water boils at a higher temperature when salt is added.
4. The freezing point of water is lowered when salt is added.
5. Antifreeze is added to a car radiator to keep the car from overheating.

At high altitude, it takes longer to cook spaghetti. (Ans 2).

Explanation:

A colligative property of a solution depends on the number of ions or solute particles present in the solution, not the type of the solute. Due to pressure change boiling points have nothing to do with colligative property and solutions.

Colligative properties include:

1) Freezing point depression.

2) Vapor pressure lowering.

3) Boiling point elevation.

4) Osmotic pressure.

At high altitude, the air is under less atmospheric pressure than it is at sea level. So at high altitude, it takes longer to cook spaghetti, because of the water it boils in is not as hot as is it at sea level.