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Q.

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

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a

Decolorization of blue CuSO4 solution by iron

b

Formation of FeCO5 from Fe

c

Liberation of H2 from steam by iron at high temperature

d

Rusting of iron sheet

answer is B.

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Detailed Solution

In Fe(CO)5 the oxidation state is zero. Every element has zero oxidation number in elemental form.
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