Q

# Help me answer: Which of the following processes does not involve oxidation of iron?

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

• Option 1)

Decolourization of blue $CuSO_{4}$ solution by iron

• Option 2)

Formation of $Fe(CO)_{5}$ from $Fe$

• Option 3)

Liberation of $H_{2}$ from steam by iron at high temperature

• Option 4)

Rusting of iron sheets

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As learnt in

Oxidation states -

Transition elements have a variety of oxidation states but the common oxidation state is +2 for 3d metals.

-

The reaction goes as follows:

$\overset{0}{Fe}+5CO\rightarrow \overset{0}{Fe}\left ( CO \right )_{5}$

Clearly, there is no change in oxidation state of iron.

Option 1)

Decolourization of blue $CuSO_{4}$ solution by iron

This option is incorrect

Option 2)

Formation of $Fe(CO)_{5}$ from $Fe$

This option is correct

Option 3)

Liberation of $H_{2}$ from steam by iron at high temperature

This option is incorrect

Option 4)

Rusting of iron sheets

This option is incorrect

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