Acetone (BP 329K) and CS2 (BP 320K) are mixed in a definite composition so that the mixture of the two behave like pure liquid and boils at 312K, then it is

BP of pure acetone = 329KBP of pure CS2 = 320KBP of Acetone - CS2 azeotrope =312KBP of the azeotrope is lesser than the BP of any of the components.Such an azeotrope is Minimum boiling azeotropelesser BP indicates higher VP than expectedSuch an azeotrope shows positive deviation