SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following does not corrode when exposed to the atmosphere-
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Fe
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Cu
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Au
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Ag
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Explanation:
Detailed explanation-1: -Since, gold (Au) is stable and chemically inert or least reactive among all, Iron (Fe), Copper (Cu), and Silver (Ag), thus, it does not corrode when exposed to the atmosphere.
Detailed explanation-2: -Aluminium and zinc react with moist air to form a thin protective layer of oxide on their surfaces. This layer prevents further corrosion of the metals.
Detailed explanation-3: -Copper, brass, and bronze do not rust for the same reason as aluminum. All three have a negligible amount of iron in them. Therefore no iron oxide, or rust, can form. However, copper can form a blue-green patina on its surface when exposed to oxygen over time.
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