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प्रश्न
Write the name.
The process of extraction of aluminium from alumina-
उत्तर
The process of extraction of aluminium from alumina- Electrolytic reduction
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संबंधित प्रश्न
How is copper extracted from its sulphide ore? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper.
Name a reducing agent that may be used to obtain manganese from manganese dioxide.
Name one metal which is extracted by electrolytic reduction.
Explain why, an aqueous solution of sodium chloride is not used for the electrolytic extraction of sodium metal.
Name two ores of zinc. Write the names of the chemical compounds present in them and give their chemical formulae.
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.
(a) Which carbon electrode (cathode or anode) is burnt away?
(b) Why is this carbon electrode burnt away?
Which metal can be extracted from the following ore?
Haematite
Aluminum is used in thermite welding:
what is thermit?
The following questions relate to the extraction of aluminium by electrolysis.
Explain why it is necessary to renew the anode periodically.
Which one of the following is not true of metal :
Metals form non-polar covalent compounds
Which one of the following is not true of metal :
Metal will have 1 or 2 or 3 electrons in their valence shell.
Answer the following question :
What is the difference between calcination and roasting.
Heating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point is known as ______.
Zinc blende is converted to oxide by ______ process.
In electrolytic reduction of alumina _______ is used as a cathode.
Iron is _______.
Explain in brief types of extraction of highly reactive metals according to their reactivity.
Explain in brief types of extraction of moderately reactive metals according to their reactivity.
In thermite welding a mixture of ____________ is ignited with a burning magnesium ribbon which produces molten iron metal as a large amount of heat is evolved.
During extraction of metals, electolytic refining is used to obtain pure metals.
(a) Which material will be used as anode and cathode for refining of silver metal by this process?
(b) Suggest a suitable electrolyte also.
(c) In this electrolytic cell, where do we get pure silver after passing electric current?
