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Write the name. Extraction of aluminium from alumina-

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प्रश्न

Write the name.

Extraction of aluminium from alumina-

एक शब्द/वाक्यांश उत्तर
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उत्तर

Electrolytic reduction

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अध्याय 8: Metallugy - Write the name [पृष्ठ १९]

संबंधित प्रश्न

Give two uses of bronze.


How is manganese extracted from manganese dioxide, MnO2? Explain with the help of an equation.


Name the method by which aluminium metal is extracted.


Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.


A black metal oxide XO2 is used as a catalyst in the preparation of oxygen gas from potassium chlorate. The oxide XO2 is also used in ordinary dry cells. The metal oxide XO2 cannot be reduced satisfactorily with carbon to form metal X.

  1. Name the metal X.
  2. Name the metal oxide XO2.
  3. Which reducing agent can be used to reduce XO2 to obtain metal X?
  4. Name another metal which can also be extracted by the reduction of its oxide with the above reducing agent.

State three objectives achieved during the roasting of ores.


Give the principles of electromagnetic separation.


Give reasons, why aluminum is used in:

making alloys


An element has its electron configuration as 2,8,8,2. Now answer the following questions.
a) What is the atomic number of this element?
b) What is the group of this element?
c) To which period does this element belong?


Give the chemical formula of :
 Cryolite 


Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process : 
Name the electrode, from which aluminium collected.  


Name the ore of mercury. With the help of balanced chemical equations, explain the process of extraction of mercury from its ore.


Name:
The allotrope of the non-metal carbon which conducts electricity.


Arrange the metals of copper, iron, magnesium, sodium and zinc in the decreasing order of reactivity.


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.


How is the method of extraction of metals high up in the reactivity series different from that for metals in the middle? Why can the same process not be applied for them? Name the process used for the extraction of these metals.


Observe the given figure of reactivity series of metals and answer the following questions:


                    Reactivity series of metals

  1. Name two metals which react with water.
  2. Name two moderately reactive metals.
  3. Name the most highly reactive metal and the most less reactive metal.

Write the molecular formulae of the following compound.

Fluorspar


Explain concept with example/explain with the help of a balanced equation.

Calcination


An alloy is


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