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प्रश्न
In Electrolytic reduction of alumina, Anode : _______ : : Cathode : Graphite lining
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उत्तर
In Electrolytic reduction of alumina, Anode : Set of carbon (graphite) rods : : Cathode : Graphite lining
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संबंधित प्रश्न
Name the following:
Main ore of aluminium.
Which of the following pairs will give displacement reactions?
Give a reasons for the following:
Carbonate and sulphide ores are usually converted into oxides during the process of extraction of metals.
In the extraction of aluminium: Write the function and formula of cryolite in the extraction of aluminium.
A zinc ore gave CO2 on treatment with a dilute acid. Identify the ore and write its chemical formula.
Name one metal which is extracted by:
Reduction with heat alone.
Bronze is an alloy of copper and ______.
Name the gas produced when calamine ore is calcined.
The two metals which can be extracted just by heating their sulphides in air are ______.
Calamine ore can be used to extract one of the following metals. This metal is:
Manganese metal is extracted from manganese dioxide by a reduction process by making use of ______.
Rock salt is an ore of one of the following metals. This metal is:
What is meant by refining of metals?
Name the following:
A compound which is added to lower the fusion temperature of the electrolytic bath in the extraction of aluminium.
Which one of the following is not true of metal :
Metal will have 1 or 2 or 3 electrons in their valence shell.
Define roasting.
Zinc blende is converted to oxide by ______ process.
Mercury, silver, gold are highly reactive metals.
Electrical wires have a coating of an insulting material. The material, generally used is
On the basis of reactivity metals are grouped into three categories:
- Metals of low reactivity
- Metals of medium reactivity
- Metals of high reactivity
Therefore metals are extracted in pure form from their ores on the basis of their chemical properties.
Metals of high reactivity are extracted from their ores by electrolysis of the molten ore.
Metals of low reactivity are extracted from their sulphide ores, which are converted into their oxides. The oxides of these metals are reduced to metals by simple heating.
(a) Name the process of reduction used for a metal that gives vigorous reaction with air and water both.
(b) Carbon cannot be used as a reducing agent to obtain aluminium from its oxide? Why?
(c) Describe briefly the method to obtain mercury from cinnabar. Write the chemical equation for the reactions involved in the process.
OR
(c) Differentiate between roasting and calcination giving chemical equation for each.
