The vapour pressure will be lowest for - Vidyadip

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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