JEE Advanced 2017 Paper 2 Chemistry Q1

Chemistry · Solutions, Mixtures & Activities · Phase Equilibria & the Phase Rule

Problem

Pure water freezes at

273\,\mathrm{K}

and

1\,\mathrm{bar}

. The addition of

34.5\,\mathrm{g}

of ethanol to

500\,\mathrm{g}

of water changes the freezing point of the solution. Use the freezing point depression constant of water as

2\,\mathrm{K\,kg\,mol^{-1}}

. The figures shown below represent plots of vapour pressure (V.P.) versus temperature (T). [molecular weight of ethanol is

46\,\mathrm{g\,mol^{-1}}

] Among the following, the option representing change in the freezing point is