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A mixture of toluene and benzene forms a...

A mixture of toluene and benzene forms a nearly ideal solution. Assume `P_B^@ and P_T^@` to be the vapor pressures of pure benzene and toluene, respectively. The slope of the line obtained by plotting the total vapor pressure to the mole fraction of benzene is :

A

`P_B^@ - P_T^@`

B

`P_T^@ - P_B^@`

C

`P_B^@ + P_T^@`

D

`(P_B^@ + P_T^@)//2`

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