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Question

Question: The vapour pressure will be lowest for....

The vapour pressure will be lowest for.

A

0.1 M sugar solution

B

0.1 M KCl solution

C

0.1 MCu(NO3)2\mathrm { Cu } \left( \mathrm { NO } _ { 3 } \right) _ { 2 }solution

D

0.1 M AgNO3\mathrm { AgNO } _ { 3 } solution

Answer

0.1 MCu(NO3)2\mathrm { Cu } \left( \mathrm { NO } _ { 3 } \right) _ { 2 }solution

Explanation

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\mathrm { Cu } \left( \mathrm { NO } _ { 3 } \right) _ { 2 } give the maximum no. of ions. (i.e., 3) so it causes the greatest lowering in vapour pressure of water.