Which of the following behaviour is true about the ideal binary liquid solution of liquids 'A' and ' — Solutions and Colligative Properties Chemistry Question

💡 Solution & Explanation

According to Raoult's law for ideal solutions, the total vapour pressure is: P_total = P_A^o * X_A + P_B^o * X_B = P_A^o * (1 - X_B) + P_B^o * X_B = P_A^o + (P_B^o - P_A^o) * X_B. Since P_A^o < P_B^o, the slope of the straight line (P_B^o - P_A^o) is positive. Thus, the plot of P_total vs X_B is linear with a positive slope.