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प्रश्न
What criterion is followed for the selection of the stationary phase in chromatography?
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उत्तर १
The stationary phase is selected in such a way that the components of the sample have different solubilities in the phase. Hence, different components have different rates of movement through the stationary phase and, as a result, can be separated from each other.
उत्तर २
A material that has a strong ability to absorb contaminants should be used as the stationary phase. Additionally, the stationary phase should have a higher capacity to adsorb contaminants than the element that needs to be cleaned. This will make it easier for the element to elute.
संबंधित प्रश्न
Describe the roles of the following: NaCN in froth floatation process
Explain column chromatography.
What is meant by the term “chromatography”?
Describe a method for refining nickel.
Describe ‘froth floatation process’ for concentration of sulphide ore.
Write the chemical equations involved in van Arkel method for refining zirconium metal.
Outline the principles behind the refining of metals by the following methods:
Zone refining method
What happens when Silver is leached with NaCN in the presence of air?
What happens when Copper matte is charged into silica lined converter and hot air blast is blown?
Name the method of refining which is Used to obtain low boiling metal.
Electrolytic refining is used to purify which of the following metals?
Which method is used for refining Zr and Ti? Explain with equation.
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: Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal.
Reason: Copper is extracted by hydrometallurgy.
Describe a method for refining nickel.
Describe a method for refining nickel.
Describe a method for refining nickel.
Describe a method for refining nickel.
