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प्रश्न
In the extraction of aluminium: Draw the diagram for the extraction of aluminium.
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उत्तर
Extraction of aluminium:
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संबंधित प्रश्न
Metallic oxides of zinc, magnesium and copper were heated with the following metals.
| Metal | Zinc | Magnesium | Copper |
| Zinc oxide | – | – | – |
| Magnesium oxide | – | – | – |
| Copper oxide | – | – | – |
In which cases will you find displacement reactions taking place?
M is a metal above hydrogen in the activity series and its oxide has the formula M2O. This oxide when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context, answer the following:
1) What kind of combination exists between M and O?
2)How many electrons are there in the outermost shell of M?
3) Name the group to which M belongs.
4) State the reaction taking place at the cathode.
5) Name the product at the anode.
Why does a new aluminium vessel lose shine so soon after use?
Name the method by which aluminium metal is extracted.
What iron compound is present in haematite ore? Also write its chemical formula.
Which of the following metals are extracted by the electrolysis of their molten chlorides?
Calamine ore can be converted into zinc oxide by the process of ______.
Which metal can be extracted from the following ore?
Haematite
Give the principles of electromagnetic separation.
Give reasons, why aluminum is used in:
In making ships
Define the following term.
Gangue
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Name the electrode, from which aluminium collected.
What is passive iron?
Froth floatation process is generally used to concentrate ______ ores.
What is the difference between calcination and roasting?
Atomic number of aluminium is _______ and its electronic configuration is _______.
Find the odd one out and give its explanation.
Observe the figure and answer the following.
- Write the name of the method.
- What is used as anode and cathode in this method?
- Write the molecular formula and use of cryolite.
- Write anode reaction.
- Write cathode reaction.
Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?
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.
