Which of the following sulphide(s) does/do not liberate H2S on warming with dil. HCl ? — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

Step 1: Identify the reactants. Magnesium hydroxide, Mg(OH)2↓, is an insoluble basic precipitate, and HCl is a strong acid. Step 2: Analyze the neutralization reaction. The acid reacts with the insoluble base to form soluble magnesium chloride (MgCl2) and water. Step 3: Because the solid precipitate is dissolved to yield a clear soluble salt solution, this is a precipitate dissolution reaction (type B). Thus, the correct option is (b).