Consider the equilibrium: HgO(s) + 4I⁻(aq) + H₂O(l) ⇌ HgI₄²⁻(aq) + 2OH⁻(aq), which changes will decr — Chemical Equilibrium Chemistry Question

💡 Solution & Explanation

To decrease the concentration of HgI₄²⁻, the equilibrium must shift backward. (c) Adding H₂O(l) dilutes the solution; the equilibrium shifts toward the side with more aqueous ions (4 moles on the left vs 3 moles on the right), shifting it backward. (d) Adding KOH adds OH⁻, a product. By Le Chatelier's principle, this shifts the reaction backward. Therefore, correct answer is C,D.