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 mole of P and 2 mole of Q would be :-

1. A. 68 torr
2. B. 140 torr
3. C. 72 torr
4. D. 20 torr

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