Give reasons for the following observations:
Lyophilic sol is more stable than a lyophobic sol.
Which reducing agent is employed to get copper from the leached low-grade copper ore?
Copper can be obtained from low-grade ore through the process of leaching using acid or bacteria (leaching is a process in which ore is treated with a suitable reagent that dissolves ore but not the impurities).
The solution containing copper can be reduced with the help of reducing agents such as scrap iron or H2 to get copper metal.
Cu2+(aq) + Fe Cu(s) + Fe2+(aq)
Cu2+ (aq) + H2(g) Cu(s) + 2 H+(aq)
Outline the principles behind the refining of metals by the following methods:
Zone refining method
Outline the principles behind the refining of metals by the following methods:
Chromatographic method
Which solution is used for the leaching of silver metal in the presence of air in the metallurgy of silver?