Give reasons for the following observations:
Lyophilic sol is more stable than a lyophobic sol.
Indicate the principle behind the method used for the refining of zinc.
Zinc is refined using electrolytic refining process. In this process, pure zinc is transported to cathode from the impure sample at the anode. The more basic metal remains in the electrolytic solution and the less basic metals, present as impurities, precipitate as anode mud.
Electrode |
Chemical Reaction |
Anode |
Zn Zn2+ +2e - |
Cathode |
Zn2+ 2e- + Zn |
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?