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प्रश्न
The following question refer to the extraction of aluminium and iron from their ores:
Iron and aluminum ores both, contain impurities. Explain briefly how these impurities are removed in each case.
उत्तर
| Aluminium | Iron |
| 1. Aluminium ore contains impurities of FeO and SiO2 | 1. Iron ore contains impurities of silica and sand. These are removed by magnetic separation . |
| 2. Bauxite containing FeO is calcinated at high temperature | 2. FeO is oxidized to Fe2O3 |
| 3. Calcinated ore is then treated with NaOH when Al2O3 is converted into soluble NaAIO2 (sodium meta - aluminate) | 3 . The insoluble Fe2O3 and silica can thus be filtered off. |
| 4. The filtrate is hydrolysed to get Aluminum hydroxide which on ignition gives pure alumina ( Al2O3). |
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संबंधित प्रश्न
Identify the term/substance in the following:
The method used to separate ore from gangue by preferential wetting
How is concentrated ore changed to oxide?
How does aluminum react with the Base ?
Why ‘the food containing iron salts’ should not be cooked in aluminium utensils?
Give composition and uses of the following alloys. Mention the reason for its use.
Duralumin
Explain the following:
Cold water has no action on aluminium.
Answer the following question :
Write the constituents of electrolyte for the extraction of aluminum.
The metals zinc and tin are present in the alloy
This is not an alloy of copper:
In the Wilfley table method, the particles of gangue are separated by __________ separation method.
