JEE Advanced 2020 Full Test 1 Paper 2

Zn+2 forms soluble complex with excess KCN but does not react with excess KI
Pb+2 is soluble in excess Kl 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
Hg22++2l−⟶Hg2I2↓
Hg2I2↓+2l−⟶[Hgl4]2−+Hg↓
Hg22++2CN−⟶‌Hg

(CN)2

(soluble)

+Hg↓