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प्रश्न
Write the name.
Extraction of aluminium from alumina-
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उत्तर
Electrolytic reduction
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संबंधित प्रश्न
Name the following:
Main ore of aluminium.
In the extraction of aluminium Write the cathode reaction in electrolytic reduction of alumina.
In the extraction of aluminium: Write the function and formula of cryolite in the extraction of aluminium.
In the extraction of aluminium: Draw the diagram for the extraction of aluminium.
Name one ore of copper (other than cuprite). Which compound of copper is present in this ore? Also, write its chemical formula.
Name the chemical compound which is electrolysed in molten state to obtain aluminium metal. Which gas is evolved during this process?
What iron compound is present in haematite ore? Also write its chemical formula.
Name the metal which is extracted from the ore called ‘rock salt’.
The two metals which can be extracted just by heating their sulphides in air are ______.
Which of the following metals can be obtained from haematite ore?
A sulphide ore is converted into metal oxide by the process of ______.
State three objectives achieved during the roasting of ores.
Aluminum is used in thermite welding:
what is ignition mixture?
Identify the process given in following passage and draw neat labelled diagram showing the process.
Electrolysis of molten mixture of alumina (melting point > 20000C) is done in a steel tank. The tank has a graphite lining on the inner side. This lining does the work of a cathode. A set of graphite rods dipped in the molten electrolyte works as anode. Cryolite (Na3AlF6) and fluorspar (CaF2) are added in the mixture to lower its melting point upto 10000C.
The following questions relate to the extraction of aluminium by electrolysis.
Explain why it is necessary to renew the anode periodically.
How is the method of extraction of metals high up in the reactivity series different from that for metals in the middle? Why can the same process not be applied for them? Name the process used for the extraction of these metals.
Extraction of moderately reactive elements is done by _______ and _______ method.
Explain in brief types of extraction of highly reactive metals according to their reactivity.
Explain in brief electrolytic reduction of alumina with a neat labelled diagram.
