Given below are the symbols of some elements:
Mg, K, Zn, H, Ag, Cu, Al, Fe Chose from the above A metal that tarnishes in the air within seconds.

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Solution

Alkali metal tarnishes very quickly in the air because it readily reacts with oxygen, moisture and carbon dioxide present in the air to form oxides, hydroxides and carbonates.
Among the given metals, Potassium (K) is very reactive it reacts with oxygen and forms form flaky white potassium peroxide( K₂O₂) in only seconds of exposure
$2 K (s) + O_{2} (g) \to K_{2} O_{2}$ (Potassium Peroxide)

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