The two equilibria, AB ⇌ A⁺ + B⁻ and AB + B⁻ ⇌ AB₂⁻ are simultaneously maintained in a solution with — Chemical Equilibrium Chemistry Question

💡 Solution & Explanation

From the first equilibrium, K₁ = [A⁺][B⁻] / [AB]. From the second, K₂ = [AB₂⁻] / ([AB][B⁻]). Taking the ratio: [A⁺] / [AB₂⁻] = (K₁[AB]/[B⁻]) / (K₂[AB][B⁻]) = (K₁/K₂) × (1 / [B⁻]²). Thus, the ratio is inversely proportional to the square of the concentration of B⁻. Therefore, correct answer is D.