Complexes formed in the following methods are :<br>(I) Mond's process for purification of nickel<br> — Coordination Compounds Chemistry Question

💡 Solution & Explanation

Step 1: Identify the complexes formed in each process. Mond's process converts nickel into volatile nickel tetracarbonyl, Ni(CO)4. Step 2: Photography fixing removes unreacted AgBr from plates by dissolving it with sodium thiosulfate (hypo) to form soluble [Ag(S2O3)2]^3-. Lead poisoning is treated by coordination with EDTA, forming a soluble [Pb(EDTA)]^2- chelate that is safely excreted. Step 3: Matching these three formulas leads to row (b).