AP EAMCET Engineering 23 Apr 2019 Shift 1 Paper

The Zn is used as a reducing agent in the extraction process of Ag and Au. The reaction is given as,
2[Ag( CN)2]( aq)+Zn( s)→ 2Ag(s)+[Zn( CN)4]2−(aq)
The statement ii is also correct as the impure zinc can be refined by the process of distillation.Thus, the option 4 is correct.