Which of the following metals do not undergo corrosion?

Iron

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Gold

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Copper

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Silver

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Solution

The correct options are
B Gold
D Silver
Corrosion is a gradual degradation of the metal surface when it comes in contact with air and moisture. A layer of metal oxide or metal sulphide, etc. is formed on the surface which has properties different from the actual metal surface.
Gold and silver are the least reactive metals. They do not react with oxygen or moisture. So, they do not undergo corrosion.

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