Q. The vapour pressure will be lowest of
A) 0.1 M sugar solution
B) 0.1 M KCl solution
C) 0.1 M $Cu(NO_{3})_{2}$ solution
D) 0.1 M $AgNO_{3}$ soution
Explanation
(c)
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 number of particles present in the solution. $Cu(NO_{3})_{2}$ give the maximum number of ions (i.e., 3)so, it causes the greatest lowering in vapour pressure of water.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.