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प्रश्न
Describe the roles of the following: NaCN in froth floatation process
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उत्तर
In the froth floatation process, NaCN is used as a depressant. It selectively allows PbS to come with the froth but prevents ZnS from coming to the froth
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संबंधित प्रश्न
Explain the principle of the method of electrolytic refining of metals. Give one example.
Explain column chromatography.
Describe a method for refining nickel.
Out of PbS and PbCO3 (ores of lead), which one is concentrated by froth floatation process preferably?
Outline the principles behind the refining of metals by the following methods:
Chromatographic method
What happens when Copper matte is charged into silica lined converter and hot air blast is blown?
In the extraction of chlorine from brine:
(i) ∆GΘ for the overall reaction is negative.
(ii) ∆GΘ for the overall reaction is positive.
(iii) EΘ for overall reaction has negative value.
(iv) EΘ for overall reaction has positive value.
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 |
Assertion: Zirconium can be purificed by Van Arkel method.
Reason: ZrI4 is volatile and decomposes at 1800 K.
Describe a method for refining nickel.
