See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

  4 6 K Fe CN     3 Fe  2 Cu    4 6 3 Fe Fe CN Blue        2 6 Cu Fe CN Chocolate brown     OH 2 Ni DMG Re d ppt.    2 2 Pb KI PbI Yellow      2 2 4 PbI KI excess K PbI     2 2 Cu KCN Cu CN Yellow          2 2 Cu CN CuCN CN White        3 4 CuCN KCN K Cu CN Colourless       Section – B