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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?

Options

  1. AThe solution shows positive deviation.
  2. BThe solution shows negative deviation.
  3. CThe solution is ideal.
  4. DThe solution has volume greater than the sum of individual volumes.

Correct answer

B. The solution shows negative deviation.

Step-by-step solution

array cc X & Y n_x=5 & n_y=10 P_x^0=63 & P_y^0=78 array aligned & aligned & P_ s( calc.) =P_x^0 x_x+P_y^0 X_y & = 63 5 15 +78 10 15 & =21+52 & =73 & P_ s (obs.) =70 & P_ s (obs.) P_ s (calc.) aligned & -ve deviation aligned

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