Consider solutions A and B
A: 500 mL of 1.0 M C6H12O6 (aq), (assume i=1)
B: 500 mL of 1.0 M KBr (aq), (assume i=2)

Which of the following statements about each solutions B.P. is true?

a. Solution A has a higher boiling point than solution B
b. Solutions A and B both boil at 100 ˚C
c. Solution A has a lower boiling point than solution B
d. Solutions A and B have the same boiling point

For solution A, i = 1 means the solution is a non-electrolyte. This clearly indicates that solution A contains covalently bonded compound. Covalently bonded compounds have lower boiling when compared to those of the ionic.

For solution B, i = 2 means the compound is an electrolyte and it forms two ions. From this result, it is very clear that the compound in solution A is an ionic compound. Ionic compounds have higher boiling points than covalent compounds

Therefore, solution A will have a lower boiling point than solution B