Which of the following is a complex formed during the extraction of silver via leaching?

AgCN [Ag(CN)2]– [Ag(CN)3]-2 [Ag(CN)4]-3

[Ag(CN)2]–

During the process of leaching, silver (Ag) is first oxidised to Ag+ and this Ag+ then combines with CN– ions to form a soluble complex. The complex formed by silver in this case is, [Ag(CN)2]–.