AIPMT PRELIMS2012Chemistry-Solutions
AIPMT PRELIMS 2012 Chemistry Raoult's Law MCQ Question
Type: MCQ-numerical-Medium-Class 12
Pₐ and P_b are the vapour pressures of pure liquid components A and B, respectively of an ideal binary solution. If xₐ represents the mole fraction of component A, the total pressure of the solution will be
A
P_b + xₐ (Pₐ − P_b)
B
Pₐ + xₐ (P_b − Pₐ)
C
Pₐ + xₐ (Pₐ − P_b)
D
P_b + xₐ (P_b − Pₐ)
Correct Answer
Option A
Detailed Explanation
The total pressure is given by Raoult's law: P_total = Pₐ · xₐ + P_b · x_b. Since x_b = 1 − xₐ, substituting gives the correct expression.
Found an issue with this question?