Give reasons for the following observations:
Leather gets hardened after tanning
Animal skin (hide) is colloidal in nature and has positively charged particles, whereas tanning consists of negatively charged colloidal particles. When a hide is soaked in tanning, mutual coagulation takes place and as a result, leather gets hardened.
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
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?