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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
Two open beakers one containing a solvent and the other containing a mixture of that solvent with a non volatile solute are together sealed in a container. Over time
  • A
    The volume of the solution does not change and the volume of the solvent decreases
  • ✓
    The volume of the solution decrease and the volume of the solvent decreases
  • C
    The volume of the solution increase and the volume of the solvent decreases
  • D
    The volume of the solution and the solvent does not change
✓

Answer

Correct option: B.
The volume of the solution decrease and the volume of the solvent decreases
b
$P_{\text {total }}= P _{ A }^{0} X _{ A }+ P _{ B }^{0} X _{ B }$

$=37 \times 0.5+119 \times 0.5$

$=78$

$P _{ A }= Y _{ A } P _{\text {total }}$

$\therefore y _{ A }=\frac{ P _{ A }}{ P _{\text {total }}}=\frac{ P _{ A }^{0} X _{ A }}{ P _{\text {total }}}=\frac{37 \times 0.5}{78}=0.237$

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