Hg2(NO3)2 + NH3(solution) -> Hg↓ + HgO.NH2NO3↓ — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

Step 1: Note that mercurous nitrate, Hg2(NO3)2, is a soluble salt in water. Step 2: Addition of ammonia solution causes disproportionation of the Hg2^2+ dimer into black metallic mercury (Hg↓) and a white precipitate of basic mercuric amidonitrate (HgO.NH2NO3↓), yielding a dark grey precipitate. Step 3: Since solid precipitates are formed from the solution, this reaction belongs to type A (precipitate formation reaction), matching option (a).