A) 0.1 M sugar solution
B) 0.1 M KCl solution
C) 0.1 M\[Cu{{(N{{O}_{3}})}_{2}}\]solution
D) 0.1 M \[AgN{{O}_{3}}\] solution
Correct Answer: C
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. \[Cu{{(N{{O}_{3}})}_{2}}\] give the maximum no. of ions. (i.e., 3) so it causes the greatest lowering in vapour pressure of water.
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