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?
Outline the principles behind the refining of metals by the following methods:
Zone refining method
Zone Refining Method:
Zone refining method is based on the principle that impurities are more soluble in the molten state than in the solid state of a metal. This method is used in the purification of elements like Germanium(Ge), Silicon(Si), Indium (In) etc.
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?