Which aqueous solution has the lowest boiling point?

a. 1.25 MC6H12O6
b. 1.25 M KNO3
c. 1.25 MCa(NO3)2
d. None of the above.

C

Explanation:

The aqueous solution C has three ions where as b 2 ions and A no Ionization

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.