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Question
Write the name.
The molecular formula of main ore of aluminium –
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Solution
The molecular formula of main ore of aluminium – Al2O3•nH2O
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RELATED QUESTIONS
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.
In the extraction of aluminium: Draw the diagram for the extraction of aluminium.
Name one metal which is extracted by electrolytic reduction.
Which one of the methods given in column I is applied for the extraction of each of the metals given in column II:
| Column I | Column II |
| Electrolytic reduction | Aluminium |
| Reduction with Carbon | Zinc |
| Reduction with Aluminium | Sodium |
| Iron | |
| Manganese | |
| Tin |
Describe with one example, how moderately reactive metals (which are in the middle of reactivity series) are extracted.
How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.
A sulphide ore is converted into metal oxide by the process of:
(a) carbonation
(b) roasting
(c) calcination
(d) anodising
Calamine ore can be converted into zinc oxide by the process of:
(a) dehydration
(b) roasting
(c) calcination
(d) sulphonation
Which one of the following is not true of metal :
Metals are good conductors of electricity.
Answer the following question:
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.
If Cu, Fe, Zn, Al elements are arranged in increasing order of their reactivity then the correct order would be which of the following?
Write the name.
Metals which are amphoteric in nature.
Explain Bayer’s process.
Explain the following reaction with the balanced equation.
Sodium aluminate reacts with water
Complete flow chart given below.
Explain the difference between Bayer’s process and Hall’s process by explaining the Bayer’s process.
The poorest conductor of heat among metals is ____________.
The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called ____________.
Which of the following metals exist in their native state in nature?
- Cu
- Au
- Zn
- Ag
- Given below are the steps for extraction of copper from its ore. Write the reaction involved.
- Roasting of copper (I) sulphide
- Reduction of copper (I) oxide with copper (I) sulphide.
- Electrolytic refining
- Draw a neat and well labelled diagram for electrolytic refining of copper
