Iron articles become reddish brown when exposed to air. It is due to the formation of:

Iron sulphate

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Iron oxide

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Iron chloride

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Iron nitrate

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Solution

The correct option is B Iron oxide
Iron objects when left open in air, slowly react with oxygen to form a reddish-brown layer of iron oxide on the metal surface.

The chemical equation is given as:
4 Fe (s) + 3 $O_{2}$ (g) + 2x $H_{2} O$ (l) → 2 ${F e}_{2} O_{3}$ .x $H_{2} O$ (s)

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