How many following metals evolve N2O gas with dil. HNO3 (20%)? Cr, Cu, Pb, Zn, Fe, Al, Ag, Au, Mn — Redox Reactions and Volumetric Analysis Chemistry Question
Question
How many following metals evolve N2O gas with dil. HNO3 (20%)? Cr, Cu, Pb, Zn, Fe, Al, Ag, Au, Mn
Answer: **5** / ALL THOSE METALS WHICH ARE MORE ELECTROPOSITIVE THAN HYDROGEN IN ELECTROCHEMICAL SERIES GIVES N2O GAS WITH DIL. HNO3(20%) EXCEPT PB AND SN. -> CR, ZN, FE, AL, MN.
💡 Solution & Explanation
Step 1: Identify the solubilities of the starting materials. Potassium ferrocyanide and copper(II) sulfate are highly soluble in water. Step 2: Analyze the reaction. Soluble copper(II) sulfate reacts with soluble potassium ferrocyanide to form an insoluble chocolate-brown precipitate of copper ferrocyanide, Cu2[Fe(CN)6]↓. Step 3: Since mixing two soluble compounds results in the formation of a solid precipitate, this is classified as a precipitate formation reaction (type A). Thus, the correct option is (a).
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