Which of the following processes does not involve oxidation of iron?

Formation of

F e (C O)_{5}

from Fe

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Liberation of

H_{2}

from steam by iron at high temperature

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Rusting of iron sheets

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Decolourization of blue

C u S O_{4}

solution by iron

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Solution

The correct option is A Formation of $F e (C O)_{5}$ from Fe
During the transformation, $F e + 5 C O \to F e (C O)_{5}$ ,

The oxidation number of iron metal is 0.

The oxidation number of iron in $F e (C O)_{5}$ is also 0 as CO is a neutral ligand having 0 oxidation number.

There is no change in the oxidation number of iron.

Iron is not oxidized.

Hence, option $A$ is correct.

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