Final answer:
The aqueous solution with the fastest evaporation rate is 0.2M NaF.
Step-by-step explanation:
The evaporation rate of an aqueous solution can be influenced by several factors, such as temperature, surface area, and concentration of solute particles. In this case, we can compare the solutions based on their concentration and the nature of the solute particles.
Lowering the freezing point is a colligative property, which depends on the number of solute particles in the solution rather than the type of solute. Therefore, we can compare the concentration of the solutions to determine the order of increasing freezing points. The higher the concentration, the lower the freezing point.
Comparing the given solutions, 0.1M NaBr and 0.2M NaF are both at the same concentration, but NaF has a smaller molar mass than NaBr. Since smaller molecules tend to have higher evaporation rates, 0.2M NaF would have the fastest evaporation rate among the given solutions.