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STD 12 -1. Solution and colligative properties — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 -1. Solution and colligative properties4 Marks
MCQ
The plot of osmotic pressure (П) vs concentration $\left(\mathrm{mol} \mathrm{L}^{-1}\right)$ for a solution gives a straight line with slope $25.73 \mathrm{~L} \mathrm{bar} \mathrm{mol}^{-1}$. The temperature at which the osmotic pressure measurement is done is

(Use $\mathrm{R}=0.083 \mathrm{~L}$ bar mol $\mathrm{m}^{-1} \mathrm{~K}^{-1}$ )

  • A
     $310^{\circ} \mathrm{C}$
  • B
    $25.73^{\circ} \mathrm{C}$
  • C
     $12.05^{\circ} \mathrm{C}$
  • ✓
     $37^{\circ} \mathrm{C}$
✓

Answer

Correct option: D.
 $37^{\circ} \mathrm{C}$
d
$ \Pi=C R T $

$ \text { Slope }=R T $

$ 25.73=0.083 \times T $

$T=\frac{25.73}{0.083}=309.47 \approx 310 \mathrm{~K}$

$\therefore \quad \text { Temperature in }{ }^{\circ} \mathrm{C} $$ =310-273 $

$ =37^{\circ} \mathrm{C}$

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