The vapour pressure of mixture ( = 600 mm Hg) is greater than the individual vapour pressure o f its constituents (Vapour pressure of CS2 = 512 mm Hg, acetone = 344 mm Hg). Hence, the solution formed shows positive deviation from Raoult's law ⇒ (1) ΔSolH>0 , (2) Raoult's law is not obeyed (3) Δsol Volume > 0 (4) CS2 and Acetone are less attracted to each ether than to themselves.