Total vapour pressure of mixture of 1 mole of volatile component A (${\mathrm{P}}_{\mathrm{B}}^{\mathrm{o}}$ =100 mm Hg) and 3 mole of volatile component B (${\mathrm{P}}_{\mathrm{B}}^{\mathrm{o}}$ =80 mm Hg) is 90 mm HS For such case:

force of attraction between A and B is smaller than that between A and A or between B and B

there is positive deviation from Raoult's 1aw

all the above statements are correct

boiling point has been lowered