alleryFor an ideal binary liquid solution, Raoult law gives the total vapour pressure as
Ap_A° + p_B°
B(p_A° + p_B°) / 2
Cp_A° × x_A + p_B° × x_B
Dp_A° × p_B°
Answer & Solution
Correct answer: C. p_A° × x_A + p_B° × x_B
1. For an ideal solution, each component obeys Raoult law individually.
2. p_A = p_A° × x_A and p_B = p_B° × x_B.
3. Total vapour pressure p = p_A + p_B = p_A° x_A + p_B° x_B.
4. This is the linear (weighted) sum characteristic of an ideal binary mixture.
_Source: syllabus Chemistry, Unit 1 "Solutions", §1.5_
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