1.

Explain the role of each of the following in the extraction of metals from their ores : Zinc in the extraction of silver.

Answer»

Solution :Silver is leached in a solution of `CN^(-)` ions to form a SOLUBLE compound. The METAL is recovered by displacement method by the addition of zinc. The reations are as under :
`4Ag (s) +8CN^(-) (aq) +2H_(2)O (aq) +O_(2) (g) to 4[Ag (CN)_(2)]^(-) (aq) +4OH^(-) (aq)`
`2[Ag (CN)_(2)]^(-) (aq) +ZN (s) to 2Ag (s) +[Zn(CN)_(4)]^(2-) (aq)`
Zinc acts as a reducing agent.


Discussion

No Comment Found

Related InterviewSolutions