How many following Ammonium salts will evolve NH3 gas on heating ? (NH4)2CO3, (NH4)2Cr2O7, CH3COONH4 — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

Step 1: Identify the reactants. Manganese(II) sulfide, MnS↓, is an insoluble precipitate. Step 2: Analyze the reaction with hydrochloric acid. Dilute mineral acid easily decomposes the sulfide salt, forming soluble manganese(II) chloride (MnCl2) and releasing hydrogen sulfide gas (H2S↑). Step 3: Because the insoluble solid precipitate MnS dissolves to form a clear solution of soluble MnCl2, this is a precipitate dissolution reaction (type B). Thus, the correct option is (b).