Practicing Success
Which of the following is true when a non-volatile solute is added to a volatile solvent? |
V.P. of solvent decreases V.P of solution formed is always less than V.P. of pure solvent V.P of solution formed is always more than V.P. of pure solvent Both (1) and (2) |
Both (1) and (2) |
When a non-volatile solute is added to a volatile solvent, its vapour pressure gets lowered because percentage surface area occupied by solvent molecules decreases. Hence rate of evaporation and vapour pressure decreases, because solute molecules occupy some surface. |