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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