A) 0.1 M sugar solution
B) \[0.1\text{ }M\text{ }KCl\]solution
C) \[0.1\text{ }M\text{ }Cu{{(N{{O}_{3}})}_{2}}\]solution
D) \[0.1\text{ }M\text{ }AgN{{O}_{3}}\]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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