Total Vapour pressure of mixture of 1molA`(p_(A)^(0)=150 "torr")`and 2molB `(p_(B)^(0)=240 "torr")`is `200 "torr"`. In this case

Options

A. There is positive deviation from Raoult's law
B. there is negative deviation from Raoult's law
C. there is no deviation from Raoult's law
D. molecular masses of A and B are also required for calculating the deviation

Answer

B

Explanation

`P_(s)=P_(A)^(@)X_(A)+P_(B)^(@)X_(B)`
`(10xx(1)/(3))+(240xx(2)/(3))`
`DeltaP_("mix")=P_(exp)-P_("theo") =-ve`.