alleryIn anodization of aluminium, the article is made the anode so that a protective layer of what forms?
AAluminium chloride
BAluminium oxide
CAluminium sulphide
DAluminium carbonate
Answer & Solution
Correct answer: B. Aluminium oxide
1. In anodization the aluminium article is used as the anode in electrolysis.
2. A thin, strong, uniform layer of aluminium oxide is formed on its surface.
3. This oxide layer blocks contact with oxygen and water, preventing further oxidation.
4. No chloride or sulphide layer is formed in anodization, so those options are wrong.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 8 "Metallurgy", p.116_
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