See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

    2 4 2 6 6 Chocolate brown ppt. 2Cu K Fe CN Cu Fe CN                 2 3 3 6 6 2 Green ppt. 3Cu 2K Fe CN Cu Fe CN               2 2 4 2 4 2 Black residue Hg Cl 2NH OH Hg Hg NH Cl NH Cl 2H O      