When iron (Fe) is exposed to moist atmosphere for a long time, rust is formed which is a layer of a brown flaky substance. What is the chemical composition of this iron rust?

Iron oxide

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Hydrated Iron oxide

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Iron

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Moisture and Oxygen

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Solution

The correct option is B Hydrated Iron oxide
In the process of rusting, iron reacts with oxygen and moisture that are present in the atmosphere to form hydrated iron oxide as per the following reaction:
$2 F e + \frac{3}{2} O_{2} + n H_{2} O \to F e_{2} O_{3} . n H_{2} O$

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Give one word for the following statement.

The brown flaky coating formed on iron when exposed to moist air.

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