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Raoult's Law

The vapour pr...

Question

The vapour pressure will be lowest for

A

0.1 M sugar solution

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B

0.1 M KCl solution

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C

0.1 M Cu(NO₃)₂ solution

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D

0.1 M AgNO₃ solution

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Solution

The correct option is C
0.1 M Cu(NO₃)₂ solution

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(NO₃)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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