Which of the following gas is not dried by conc. H2SO4 ? — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

Step 1: Identify the reactants. Ferric cyanide, Fe(CN)3↓, is an insoluble precipitate. Step 2: Analyze the complexation. The addition of potassium cyanide (KCN) provides excess cyanide ligands that coordinate with iron(III) to form the highly stable, soluble coordination complex potassium ferricyanide (K3[Fe(CN)6]). Step 3: Since the solid ferric cyanide precipitate dissolves to yield a clear soluble complex solution, this is a precipitate dissolution reaction (type B). Thus, the correct option is (b).