Q 1319023810.     Mole fraction of the benzene in the vapour phase which is in equilibrium with a solution of benzene (`p^0=120` torr) and toluene(`p^0=80` torr) having `4` mole of benzene and `6` mole of toluene in solution.

A

`0.50`

B

`0.40`

C

`0.30`

D

`0.20`

HINT

Use formula: `p_T = x_1p_1^0 + x_2p_2^0`

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