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प्रश्न
What happens when Silver is leached with NaCN in the presence of air?
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उत्तर
Ag is leached with NaCN in presence of air.
4Ag(s)+ 8CN-(aq) + 2H2O(aq)+ O2(g) → 4[Ag (CN)2]-(aq) + 4OH- (aq)
2[Ag(CN)2]-(aq)+Zn(s) →[Zn(CN)4]2- (aq) + 2Ag(s)
Ag is obtained as solid by leaching process.
संबंधित प्रश्न
Name the method used for the refining of zirconium.
What is meant by the term “chromatography”?
Outline the principles behind the refining of metals by the following methods:
Zone refining method
Write the principle behind the following methods of refining:
Vapour-phase refining
How are metals used as semiconductors refined? What is the principle of the method used?
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: Nickel can be purified by Mond process.
Reason: \[\ce{Ni(CO)4}\] is a volatile compound which decomposes at 460 K to give pure Ni.
Purification of crude metals by removing metallic and non-metallic impurities is known as ______ of metals.
Describe a method for refining nickel.
Describe a method for refining nickel.
