5 moles of liquid X and 10 moles of liquid Y make a solution having a vapour pressure of 70 torr. The vapour pressures of pure X and Y are 63 torr and 78 torr respectively. Which of the following is true regarding the described solution?

1. A. The solution has volume greater than the sum of individual volumes.
2. B. The solution shows positive deviation.
3. C. The solution shows negative deviation.
4. D. The solution is ideal.

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