Consider the given plots of vapour pressure (VP) vs temperature (T/K). Which amongst the following options is the correct graphical representation showing , depression in the freezing point of solvent

Question

Consider the given plots of vapour pressure (VP) vs temperature (T/K). Which amongst the following options is the correct graphical representation showing , depression in the freezing point of solvent in a solution?

(Four graphs shown: (a) solution curve above liquid solvent, ΔTf shown; (b) frozen solution and liquid solvent curves; (c) frozen solution and liquid solvent with solution below; (d) solution and frozen solution curves)

Canvas Classes · Accepted Answer

Strategy:
 A solution freezes when its vapor pressure equals the vapor pressure of the solid solvent. Identify the graph that correctly shows the solution curve below the pure solvent curve and the intersection at a lower temperature ().

Analysis:
- The vapor pressure of a solution is always lower than that of the pure solvent at the same temperature.
- The freezing point  is where the solution curve intersects the "frozen solvent" (ice) curve.
- Because the solution curve is lower, it intersec

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