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प्रश्न
Explain in brief types of extraction of less reactive metals according to their reactivity.
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उत्तर
Extraction of less reactive metals:
- Less reactive metals such as gold, silver, platinum are found in a free state in nature.
- However, the reserves of copper in the free state are very few. It is found mainly in the form of Cu2S. Copper is obtained from Cu2S ore just by heating in the air.
\[\ce{\underset{\text{sulphide}}{\underset{\text{Copper(I)}}{2Cu2S_{(s)}}} + \underset{\text{Oxygen}}{3O_{2(g)}} ->[Heat] \underset{\text{oxide}}{\underset{\text{Copper(I)}}{2Cu2O_{(s)}}} + \underset{\text{dioxide}}{\underset{\text{Sulphur}}{2SO2\uparrow}}}\]
\[\ce{\underset{\text{Copper(I) sulphide}}{Cu2S_{(s)}} + \underset{\text{Copper(I) oxide}}{2Cu2O_{(s)}} ->[Heat] \underset{\text{Copper}}{6Cu_{(s)}} + \underset{\text{Sulphur dioxide}}{SO_2\uparrow}}\] - The copper metal thus obtained can be further refined electrolytically.
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संबंधित प्रश्न
Metallic oxides of zinc, magnesium and copper were heated with the following metals.
| Metal | Zinc | Magnesium | Copper |
| Zinc oxide | – | – | – |
| Magnesium oxide | – | – | – |
| Copper oxide | – | – | – |
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In the extraction of aluminium: Draw the diagram for the extraction of aluminium.
Define the term gangue.
Name two metals which are always found in combined state.
Explain how, mercury is extracted from its sulphide ore (cinnabar). Give equations of the reactions involved.
In an electrolytic tank, aluminium metal is being extracted by the electrolysis of molten aluminium oxide using carbon electrodes. It is observed that one of the carbon electrodes is gradually burnt away and has to be replaced.
- Which carbon electrode (cathode or anode) is burnt away?
- Why is this carbon electrode burnt away?
Which metal can be extracted from the following ore?
bauxite
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In aluminiothermy
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what is ignition mixture?
Define the following term.
Mineral
Name the following:
The process in which an ore is heated in air so that oxygen gets added to it to form the oxides.
Arrange the metals of copper, iron, magnesium, sodium and zinc in the decreasing order of reactivity.
Choose the correct answer from the options given below:
The metal is a liquid at room temperature.
Name the methods by which concentrated ore is converted to metallic oxide.
Explain Bayer’s process.
Explain the difference between Bayer’s process and Hall’s process by explaining the Bayer’s process.
Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper, etc. are reduced by using:
Which of the following metals exist in their native state in nature?
(i) Cu
(ii) Au
(iii) Zn
(iv) Ag
