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प्रश्न
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.
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उत्तर
Electrolytic reduction of Alumina :
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संबंधित प्रश्न
Name one metal which is extracted by electrolytic reduction.
Which gas is produced during the extraction of aluminium? At which electrode is this gas produced?
Which metal is extracted from bauxite ore?
Which of the following metals are extracted by the electrolysis of their molten chlorides?
(a) Na and Hg
(b) Hg and Mg
(c) Na and Mg
(d) Cu and Fe
Give the principles of electromagnetic separation.
Give the chemical formula of :
Sodium aluminate
Name the following:
The process of heating a substance very strongly in such a way that it does not combine with oxygen.
What is passive iron?
Name : The metal which is liquid at room temperature.
How many valence electrons are present in non- metals?
Which one of the following is not true of metal :
Metals are malleable and ductile
Which one of the following is not true of metal :
Metal will have 1 or 2 or 3 electrons in their valence shell.
Define calcination.
Name the process used for the enrichment of sulphide ore.
Carbon cannot reduce the oxides of sodium, magnesium, and aluminum to their respective metals. Why? Where are these metals placed in the reactivity series? How are these metals obtained from their ores? Take an example to explain the process of extraction along with chemical equations.
Sulphide ores : Roasting : : Carbonate ores : _______
Zinc sulphide : Roasting : : zinc carbonate : _______
The poorest conductor of heat among metals is ____________.
Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?
