For a dilute solution, Raoult's law states that

Options

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 the solute.

Answer

B

Explanation

According to roults law , for a dilute solution the relative lowering of vapour pressure is equal to the mole fraction of solute .
`(P_A^0-P_A)/(P_A^0)=X_B`
Where
`(P_A^0-P_A)/(P_A^0)`= Relative lowering of vapour pressure
`X_B` = mole fraction of solute.