Solutions and Colligative Properties - Result Question 11
12. For a dilute solution, Raoult’s law states that
$(1985,1 M)$
(a) the lowering of vapour pressure is equal to the mole fraction of solute
(b) the relative lowering of vapour pressure is equal to the mole fraction of solute
(c) the relative lowering of vapour pressure is proportional to the amount of solute in solution
(d) the vapour pressure of the solution is equal to the mole fraction of solvent
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Answer:
Correct Answer: 12. (b)
Solution:
The relative lowering of vapour pressure :
$ \frac{-\Delta p}{p^{\circ}}=\chi _2 \quad \text { (mole fraction of solute) } $
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