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प्रश्न
A to F below relate to the source and extraction of either zinc or aluminium.
- Bauxite
- Coke
- Cryolite
- Froth floatation
- Sodium hydroxide solution
- Zinc blende
Fill in the blanks using the most appropriate words from A to F:
(i) The ore from which aluminium is extracted must be treated with ______ so that pure aluminium oxide can be obtained.
(ii) Pure aluminium oxide is dissolved in ______ to make a conducting solution.
उत्तर
(i) The ore from which aluminium is extracted must be treated with Sodium hydroxide solution so that pure aluminium oxide can be obtained.
(ii) Pure aluminium oxide is dissolved in Cryolite to make a conducting solution.
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संबंधित प्रश्न
For the substance given below, describe the role played in the extraction of aluminium.
Graphite
Aluminium is said to be more reactive than iron, towards oxygen (or air) yet iron undergoes corrosion to a greater extent than aluminum. Explain.
Name the process by which the refining of aluminium is done ?
For cryolite, explain its significance in the extraction of aluminium.
Explain the following:
In construction work, why is the alloy of aluminium-duralumin used rather than pure aluminium?
| Aluminium is extracted from its chief ore, bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction. |
Name a chemical used for dissolving aluminium oxide. In which state is the chemical used?
Give reason for the following:
Extraction of aluminium was very difficult in the beginning.
Why is food containing iron salts should not be cooked in aluminium utensils?
Explain why :
Iron sheets are coated with zinc during galvanization.
Name the compound added to pure alumina to lower the fusion temperature during the electrolytic reduction of alumina.
