Advertisements
Advertisements
Question
What happens when Silver is leached with NaCN in the presence of air?
Advertisements
Solution
Ag is leached with NaCN in presence of air.
4Ag(s)+ 8CN-(aq) + 2H2O(aq)+ O2(g) → 4[Ag (CN)2]-(aq) + 4OH- (aq)
2[Ag(CN)2]-(aq)+Zn(s) →[Zn(CN)4]2- (aq) + 2Ag(s)
Ag is obtained as solid by leaching process.
RELATED QUESTIONS
Name the method of refining of metals such as Germanium.
Out of PbS and PbCO3 (ores of lead), which one is concentrated by froth floatation process preferably?
Write the principle behind the following methods of refining:
Vapour-phase refining
Name the method of refining which is Used to obtain low boiling metal.
Zone refining is based on the principle that ______.
Match the items of Column I with the items of Column II and assign the correct code:
| Column I | Column II |
| (A) Coloured bands | (1) Zone refining |
| (B) Impure metal to volatile complex | (2) Fractional distillation |
| (C) Purification of Ge and Si | (3) Mond Process |
| (D) Purification of mercury | (4) Chromatography |
| (5) Liquation |
Describe a method for refining nickel.
Describe a method for refining nickel.
Describe a method for refining nickel.
Describe a method for refining nickel.
