Two liquids $\mathrm{A}$ and $\mathrm{B}$ have ${\mathrm{P}}_{{\mathrm{A}}^0}\mathrm{ }:\mathrm{ }{\mathrm{P}}_{{\mathrm{B}}^0}=1\mathrm{ }:\mathrm{ }3$ at a certain temperature. If the mole fraction ratio of ${\mathrm{x}}_{\mathrm{A}}\mathrm{ }:\mathrm{ }{\mathrm{x}}_{\mathrm{B}}=1\mathrm{ }:\mathrm{ }3$, the mole fraction of $\mathrm{A}$ in vapour in equilibrium with the solution at a given temperature is -

$2$ moles of ${\mathrm{N}}_2{\mathrm{O}}_4$ is heated to form $\mathrm{NO}$ and ${\mathrm{O}}_2$. As soon as $\mathrm{NO}$ and ${\mathrm{O}}_2$ are formed they react to form ${\mathrm{N}}_2{\mathrm{O}}_5$.

${\mathrm{N}}_2{\mathrm{O}}_4\left(\mathrm{g}\right)\rightleftharpoons 2\mathrm{NO}\left(\mathrm{g}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)$

$2\mathrm{NO}\left(\mathrm{g}\right)+\frac{3}{2}{\mathrm{O}}_2\left(\mathrm{g}\right)\rightleftharpoons {\mathrm{N}}_2{\mathrm{O}}_5\left(\mathrm{g}\right)$

are simultaneously established. At equilibrium, the degree of dissociation of ${\mathrm{N}}_2{\mathrm{O}}_4$ was found to be $50\%$. Which of the following is/are incorrect at equilibrium?