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प्रश्न
In the electrolytic reduction of alumina, the lining of graphite acts as an anode.
पर्याय
Right
Wrong
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उत्तर
In the electrolytic reduction of alumina, the lining of graphite acts as an anode- Wrong
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संबंधित प्रश्न
The process by which sulphide ore is concentrated.
Why do gold ornaments look new even after several years of use?
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 sodium metal. Which gas is produced in this process?
Name the electrode at which aluminium metal is produced.
Which of the following is an iron ore?
The metal which can be extracted simply by heating the cinnabar ore in air is ______.
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Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
What is the function of cryolite used along with alumina as the electrolyte?
What is meant by concentration of ores?
What is passive iron?
The following questions relate to the extraction of aluminium by electrolysis.
Explain why it is necessary to renew the anode periodically.
Calcium, copper, lead, aluminium, zinc, chromium, magnesium, iron.
Choose the major metals from the list given above to make the following alloys:
(a) Stainless steel
(b) brass
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.
Observe the given figure of reactivity series of metals and answer the following questions:
Reactivity series of metals
- Name two metals which react with water.
- Name two moderately reactive metals.
- Name the most highly reactive metal and the most less reactive metal.
Sulphide ores : Roasting : : Carbonate ores : _______
Zinc sulphide : Roasting : : zinc carbonate : _______
Explain the concept of Roasting.
Explain the following reaction with the balanced equation.
Ferric oxide is reacted with aluminium.
Explain the following reaction with the balanced equation.
Zinc sulphide is heated strongly in excess of air
