Q.41. The partial vapour pressure of any volatile component of a solution is equal to the vapour pressure of the pure component multiplied by its mole fraction in the solution is called
A. Dalton’s law
B. Avogadro’s law
C. Raoult’s law
D. Henry’s law
Answer :- C. Raoult’s law
Explanation :-
The statement that “The partial vapor pressure of any volatile component of a solution is equal to the vapor pressure of the pure component multiplied by its mole fraction in the solution” is known as Raoult’s law. Therefore, the correct answer is:Option C Raoult’s law
Raoult’s law can be mathematically expressed as:PA=PA∗⋅XA
Where:
- PA = partial vapor pressure of component A in the solution
- PA∗ = vapor pressure of the pure component A
- XA = mole fraction of component A in the solution
This law applies to ideal solutions, where the interactions between molecules of different components are nearly the same as the interactions between molecules of the same components. In such mixtures, the presence of other components does not affect the vapor pressure of any given component significantly, other than through the mole fraction.
Actual solutions may deviate from Raoult’s law, especially at higher concentrations or with components that interact strongly with each other.