Question

In cyanide extraction process of silver pond argentite ore name the oxidizing and reducing agents.write the chemical equations of reactions involved

Answer 1

• In 1776 the "Virreinato del Río de la Plata" (Viceroyalty of the Río de la Plata) was created, named after the river; it included present-day Argentina, Bolivia, Paraguay and Uruguay.

Answer 2

Explanation:

The extraction of silver involves in cyanide process are

(i) Ag

2

S+2CN

−

+O

2

→23[Ag(CN)

2

]

−

+SO

2

(ii) [Ag(CN)

2

]

−

+Zn→[Zn(CN)

4

]

2−

+Ag

Thus, in (i) O

2

−act as oxidising agent (oxidise sulphide to SO

2

) and in (ii) Zn act as reducing agent (reduce Ag

+

to Ag).