A) Increase of vapour pressure
B) Depression of freezing point
C) Elevation of boiling point
D) Increase of osmotic pressure
Correct Answer: A
Solution :
According to Roults law, for a solution of non-volatile solute. \[{{P}_{\text{solution}}}={{P}_{\text{solvent}}}\times {{X}_{\text{solvent}}}\] where, \[{{X}_{\text{solvent}}}=\] the mole fraction of solvent Hence, with the addition of some solvent, the mole-fraction of solvent increase and consequently the vapour-pressure of solution also increase.
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