Which of the following will increases the boiling point of water? I. Taking it to a high altitude II. Dissolving a salt into it III. Heating it in a sealed flask IV. Increasing the rate of heat supply .
A. I only B. III & IV only C. II & III only D. II only
Correct Answer: C
Explanation
The simplest way to change the boiling point of a liquid is to change the surrounding pressure. (a) Using a closed system to artificially increase that pressure will raise the boiling point of a liquid. (b) Boiling point is dependent upon the strength of the bonds between its molecules. For this reason, adding a solute to the liquid will create stronger bonds between molecules, raising the solution’s boiling point without increasing pressure.
