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प्रश्न
Explain and give reasons why aluminium vessels should not be cleaned with powders containing alkalis.
उत्तर
Aluminium vessels should not be cleaned with powders containing alkalis because aluminium reacts with alkalis to form respective aluminate and hydrogen as:
\[\ce{2Al + 2NaOH + 2H2O -> 2NaAlO2 + 3H2}\]
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संबंधित प्रश्न
Answer the following questions with respect to the electrolytic process in the extraction of aluminum:
Explain why powdered coke is sprinkled over the electrolytic mixture.
Name the constituents of Solder.
In order to obtain 1 tonne of aluminium, the following inputs are required: 4 tonnes of bauxite, 150 kg of sodium hydroxide and 600 kg of graphite. The aluminium compound in bauxite is aluminium oxide and the main impurity is iron (III) oxide. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.
When bauxite is treated with sodium hydroxide solution, what happens to:
- the aluminium oxide,
- the iron (III) oxide?
Aluminium is extracted from its chief ore, bauxite. The ore is first purified and then the metal is
extracted from it by electrolytic reduction
Mention one reason for the use of aluminium in thermite welding ?
An aqueous solution of sodium chloride is not used for electrolytic reduction of sodium metal. Why?
In order to obtain one tone of aluminium, the following inputs are required:
4 tones of bauxite, 150 Kg of sodium hydroxide and 600 Kg of graphite.
The aluminium compound in bauxite is aluminium oxide and the main impurity is iron (II) oxide. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.
In construction work, why is the alloy of aluminium, duralumin used rather than pure aluminium.
Describe the role played in the extraction of aluminum:
Sodium hydroxide
Describe the role played in the extraction of aluminum : Graphite
Write the balanced chemical equation to show the concentration of ore in Baeyer’s process.
Sodium aluminate to aluminium hydroxide
The compound that is not a constituent of the electrolytic mixture used in Hall-Heroult's process is ______.
