For an ideal solution containing two liquid components A and B, the Gibb’s free energy of mixing is — Solutions and Colligative Properties Chemistry Question

💡 Solution & Explanation

For an ideal solution, $\Delta G_{\text{mix}} = RT(X_A \ln X_A + X_B \ln X_B)$. This function is symmetric and reaches its minimum value when $X_A = X_B = 0.5$. Thus, the molar ratio is 1:1. Therefore, correct answer is A.