What is the primary purpose of anodising aluminium?
To enhance its corrosion resistance and appearance
Aluminium naturally forms a thin oxide layer (Al₂O₃) on its surface that provides some corrosion protection. Anodising is an electrolytic process that thickens this oxide layer artificially, making it much harder, durable, and corrosion-resistant. The porous oxide can also be dyed to give the surface a decorative finish.
Anodising does not make aluminium softer, does not increase its reactivity with acids (the oxide layer actually protects it), and does not improve electrical conductivity.
The correct answer is : To enhance its corrosion resistance and appearance.
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Important Questions from Chemical Reaction
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I. In physical change new substance is formed. substance is formed.
II. In chemical change no new substance is formed.
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The information not obtained from balanced chemical equation is
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