Class 12 NEET Chemistry Coordination Compounds

Copper being more electropositive readily precipitate silver from their salt (Ag+) solution.
Cu+2AgNO3 →Cu(NO3)2+Ag
In K[Ag(CN)2] solution a complex anion [Ag(CN)2]− is formed so Ag+ ions are less available in the solution and Cu cannot displace Ag from this complex ion.