4 mole of pure liquid $\left({\mathrm{P}}_{\mathrm{A}}^0=80\mathrm{mm} \mathrm{of} \mathrm{Hg}\right)$ and 6 mole of pure liquid $\left({\mathrm{P}}_{\mathrm{B}}^0=80\mathrm{mm} \mathrm{of} \mathrm{Hg}\right)$are mixed. The vapor pressure of the resulting solution is found to be 90 mm of Hg then

It is an ideal solution

The solution shows negative deviation from Raoult's law

The solution is formed by the absorption of heat.

The solution will boil at higher temperature than expected