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197. A white-gray powdery deposit can usually be found on which of the following metals?
Aluminum forms a characteristic white-gray powdery oxide/hydroxide film upon corrosion, making it the expected answer. Steel corrosion typically presents as reddish-brown rust, while magnetite is a black iron oxide. Magnesium can form light-colored oxides, but aluminum is the standard association for this specific powdery appearance.
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