Q .     The vapour pressure of two liquids `P` and `Q` are `80` and `60` torr respectively. The total vapour pressure of solution obtained by mixing `3` moles of `P` and `2` moles of `Q` would be

AIIMS 2012
A

`140` torr

B

`20` torr

C

`68` torr

D

`72` torr

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