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प्रश्न
Aluminium is a more active metal than iron, but suffers less corrosion. Why?
उत्तर
Aluminium is a more active metal than iron, but suffers less corrosion because of the formation of a thin, transparent, protective, non-porous adhering film of aluminium oxide on the surface of aluminium which makes it resistant to corrosion .
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संबंधित प्रश्न
Write the equation for the reaction where the aluminum oxide for the electrolytic extraction of aluminum is obtained by heating aluminum hydroxide.
For the substance given below, describe the role played in the extraction of aluminium.
Sodium hydroxide
Aluminium is extracted from its chief ore, bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction.
Write an equation for the reaction which takes place at the anode during the extraction of aluminium by the electrolytic process.
How is ore purified (give equations also)
For the substance listed below, explain its role in the extraction of aluminium: Cryolite
For the substance listed below, explain its role in the extraction of aluminium: Graphite
Describe the role played in the extraction of aluminum : Graphite
Name the solution used to react with bauxite as a first step in obtaining pure aluminium oxide, in the Baeyer's process.
Name the compound added to pure alumina to lower the fusion temperature during the electrolytic reduction of alumina.
Answer the following question:
Write the chemical formula of one main ore of iron and aluminium.
