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 properly\[i.e.\], 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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