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ChemistryNEET 2024Colligative properties

Solutions

The plot of osmotic pressure (Π\Pi) vs concentration (mol L−1\mathrm{mol\,L^{-1}}) for a solution gives a straight line with slope 25.73 L bar mol−125.73\ \mathrm{L\,bar\,mol^{-1}}. The temperature at which the osmotic pressure measurement is done is (use R=0.083 L bar mol−1 K−1R = 0.083\ \mathrm{L\,bar\,mol^{-1}\,K^{-1}}):

  1. A.310 °C
  2. B.25.73 °C
  3. C.12.05 °C
  4. D.37 °C✓

Solution

Π=CRT\Pi = CRT, so the slope of Π\Pi against CC is RTRT: T=25.730.083=310T = \frac{25.73}{0.083} = 310 K =37∘= 37^\circC.

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