Question

Which graph correctly shows the effect on the freezing point caused by increasing the molality of a solution ?

Answer 1

The answer to your question is graph A :)

Answer 2

Answer:

The first one among the four attached graphs correctly shows the effect on the freezing point caused by increasing the molality of a solution

Explanation:

According to colligative property of molecules- $\Delta T_{f}=k_{f}.m$

where $\Delta T_{f}$ is the depression in freezing point $(F_{p})$

$k_{f}$ is cryogenic constant of solvent and m is molality of solution

As $k_{f}$ is constant for a certain solvent therefore the above relation is similar to linear equation y=mx. here y represents $\Delta T_{f}$ and x represents m

So a graph between $\Delta T_{f}$ and m would give straight line passing through origin

If we extrapolate the first graph by joining all the points then it will give a straight line passing through origin.

Hence the first graph is the correct one depicting change in freezing point with molality