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Q.

The vapour pressure will be lowest for

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a

0.1 M sugar solution

b

0.1 M KCl solution

c

0.1MCuNO32

d

0.1MAgNO3 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. CuNO32  give the maximum no. of ions. (i.e., 3) so it causes the greatest lowering in vapour pressure of water
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The vapour pressure will be lowest for