See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

Zn+2 forms soluble complex with excess KCN but does not react with excess KI Pb+2 is soluble in excess KI but insoluble in excess KCN Ag+ is soluble in excess KCN but insoluble in excess KI Hg2 +2 gives ppt of Hg when reacts with KI as well as well as excess KCN 2 2 2 2 2 2 2 4 2 2 2 2 2 2                  (soluble) Hg I Hg I Hg I I [HgI ] Hg Hg CN Hg(CN) Hg