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CUET · CHEMISTRY · PYQ PAPER 2023

The vapour pressure of pure benzene is } \(0.900\) bar. If a non-volatile electrolytic solid is added, the vapour pressure of the solution becomes \(0.200\) bar. If the number of moles of solute and solvent in the solution are \(1\) and \(2\) respectively, what is the value of van't Hoff factor (i)?

  1. A \(2.33\)
  2. B \(0.56\)
  3. C \(1.56\)
  4. D \(2.00\)
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Answer & Solution

Correct Answer

(A) \(2.33\)

Step-by-step Solution

Detailed explanation

\( x_B = \frac{n_B}{n_A + n_B} = \frac{1}{2+1} = \frac{1}{3} \) \( \frac{P_A^0 - P_A}{P_A^0} = i \cdot x_B \) \( \frac{0.900 - 0.200}{0.900} = i \cdot \frac{1}{3} \) \( \frac{0.700}{0.900} = i \cdot \frac{1}{3} \)…
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