${\mathrm{P}}_{\mathrm{A}}=(235\mathrm{y}-125\mathrm{xy})\mathrm{mm}$ of $\mathrm{Hg}.{\mathrm{P}}_{\mathrm{A}}$ is partial pressure of $\mathrm{A}, \mathrm{x}$ is mole fraction of $\mathrm{B}$ in liquid phase in the mixture of two liquids $\mathrm{A}$ and $\mathrm{B}$ and $\mathrm{y}$ is the mole fraction of $\mathrm{A}$ in vapour phase, then ${\mathrm{P}}_{\mathrm{B}}°$ in $\mathrm{mm}$ of $\mathrm{Hg}$ is:

${\mathrm{FeCl}}_3$ on reaction with ${\mathrm{K}}_4\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]$ in aqueous solution gives blue colour. These are separated by a semipermeable membrane AB as shown. Due to osmosis, there is

The following graph represents variation of boiling point with composition of liquid and vapours of binary liquid mixture. The graph is plotted at constant pressure, for a solution of mole fraction $0.5$

Which of the following statement(s) is correct.