Which metal is protected by a layer of its own oxide \( \mathrm{P} ...

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Which metal is protected by a layer of its own oxide
\( \mathrm{P} \)
(1) \( \mathrm{Al} \)
W
(2) \( \mathrm{Ag} \)
(3) \( \mathrm{Au} \)
(4) \( \mathrm{Fe} \)
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