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The vapour pressure will be lowest for

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0.1 M KCl solution

$0.1 MCu {({NO}_{3})}_{2}$

$0.1 {MAgNO}_{3}$ solution

0.1 M sugar solution

answer is C.

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Detailed 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. $Cu {({NO}_{3})}_{2}$ give the maximum

no. of ions. (i.e., 3) so it causes the greatest lowering in vapour pressure of water

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