AIPMT PRELIMS 2012 Chemistry Raoult's Law MCQ Question
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
P_b + xₐ (Pₐ − P_b)
Pₐ + xₐ (P_b − Pₐ)
Pₐ + xₐ (Pₐ − P_b)
P_b + xₐ (P_b − Pₐ)
Correct Answer
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.
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