NiCl2 + 2dmg -(NH4OH)-> Ni(dmg)2↓ — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

Step 1: Nickel(II) chloride and dimethylglyoxime (dmg) are soluble species in an ammoniacal solution. Step 2: Upon reaction in the presence of ammonium hydroxide, they form a highly insoluble, bright cherry-red coordination complex of nickel dimethylglyoximate, Ni(dmg)2↓. Step 3: Since a solid precipitate is formed from a clear solution, this is classified as a precipitate formation reaction (type A), matching option (a).