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1. Solution and colligative properties — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry1. Solution and colligative properties1 Mark
MCQ
The vapour pressure will be lowest for
  • A
    $0.1 M$  sugar solution
  • B
    $0.1 M KCl $ solution
  • ✓
    $0.1 M$ $Cu{(N{O_3})_2}$solution
  • D
    $0.1 M$  $AgN{O_3}$ solution
✓

Answer

Correct option: C.
$0.1 M$ $Cu{(N{O_3})_2}$solution
c
(c) Vapour pressure of a solvent is lowered by the presence of solute in it. Lowering in vapour pressure is a colligative property i.e., it depends on the no. of particles present in the solution. $Cu{(N{O_3})_2}$ give the maximum no. of ions. $(i.e., 3) $ so it causes the greatest lowering in vapour pressure of water.

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