Which is a practical application of boiling-point elevation?

a. cooling a supersaturated sugar-and-water solution to form rock candy.

b. burning coal to make the steam that powers a steam engine.

c. adding antifreeze to water in a car radiator in summer to raise the boiling point.

d. boiling sea water to recover the salt it contains.

Boiling-point is the point of a pure liquid matter starts to evaporate and change into gaseous phase. It is where the set of conditions such as the pressure and temperature enough to do so. Boiling-point elevation, on the other hand, is the phenomenon of which the boiling point of a pure liquid matter is elevated because of the dissolved substances. A great example would be the boiling point of a distilled water (pure water) which is lesser than the boiling point of a sea water because of the dissolved salts. A pure water boils at 100°C at atmospheric pressure while a salt water boils at higher temperature than 100°C at the same pressure. Thus, the answer is D.

The se-ci  bonds is more polar  than s-br bond