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प्रश्न
In the metallurgy of aluminium ______.
विकल्प
\[\ce{Al^{3+}}\] is oxidised to \[\ce{Al(s)}\].
graphide anode is oxidised to carbon monoxide and carbon dioxide.
oxidation state of oxygen changes in the reaction at anode.
oxidation state of oxygen changes in the overall reaction involved in the process.
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उत्तर
In the metallurgy of aluminium graphide anode is oxidised to carbon monoxide and carbon dioxide.
Explanation:
\[\ce{2Al2O3 + 3C -> 4Al + 3CO2}\]
This process of electrolysis is widely known as Hall-Heroult process. Thus, electrolysis of the molten mass is carried out in an electrolytic cell using carbon electrodes. The oxggen liberated at anode reacts with the carbon of anode producing \[\ce{CO}\] and \[\ce{CO2}\].
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संबंधित प्रश्न
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Why is the extraction of copper from pyrites more difficult than that from its oxide ore through reduction?
Write down the reactions taking place in different zones in the blast furnace during the extraction of iron.
Write chemical reactions taking place in the extraction of zinc from zinc blende.
State the role of silica in the metallurgy of copper.
The choice of a reducing agent in a particular case depends on thermodynamic factor. How far do you agree with this statement? Support your opinion with two examples.
Write chemical reactions taking place in the extraction of copper from Cu2 S.
How will you convert the following:
Zinc blende to Zinc metal
The impurity that is added externally to remove the impurity already present in the ore is known as ____________.
In the extraction of copper from its sulphide ore, the metal is formed by the reduction of \[\ce{Cu2O}\] with ______.
Below point ‘A’ \[\ce{FeO}\] can ______.
For the reduction of \[\ce{FeO}\] at the temperature corresponding to point D, which of the following statements is correct?
For the metallurgical process of which of the ores calcined ore can be reduced by carbon?
(i) Haematite
(ii) Calamine
(iii) Iron pyrites
(iv) Sphalerite
How is copper extracted from low grade copper ores?
Why is sulphide ore of copper heated in a furnace after mixing with silica?
Write down the reactions taking place in Blast furnace related to the metallurgy of iron in the temperature range 500-800 K.
Explain the following:
\[\ce{CO2}\] is a better reducing agent below 710 K whereas \[\ce{CO}\] is a better reducing agent above 710 K.
Explain the following:
Silica is added to the sulphide ore of copper in the reverberatory furnace.
Assertion: For the extraction of iron, haematite ore is used.
Reason: Haematite is a carbonate ore of iron.
\[\ce{Au + CN^- + H2O + O2 -> [Au(CN)2]^- + OH^-}\]
The number of CN− ions involved in the balanced equation is ______.
