Which of the following materials does not form adherent oxide film on surface ?
Correct answer: D. Gold & silver
- A. Copper
- B. Nickel
- C. Aluminium
- D. Gold & silver
Explanation
Aluminium, copper and nickel can form adherent oxide films that protect their surfaces from further oxidation. Gold and silver are noble metals and generally do not form a protective adherent oxide film under ordinary conditions.
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