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Which of the following processes does not involve oxidation of iron?
medium
RedoxReactions
2015
chemistry
Decolourization of blue CuSO 4 _4 4 ā solution by iron.
Formation of Fe(CO) 5 _5 5 ā from Fe.
Liberation of H 2 _2 2 ā from steam by iron at high temperature.
Explanation To determine which process does not involve the oxidation of iron, we need to analyze each option. \\
Option 1: Decolourization of blue C u S O 4 \mathrm{CuSO}_4 CuSO 4 ā solution by iron. \\
ā¢ In this process, iron (Fe) displaces copper (Cu) from C u S O 4 \mathrm{CuSO}_4 CuSO 4 ā
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solution.
ā¢ The reaction is:
F e + C u S O 4 ā F e S O 4 + C u \mathrm{Fe} + \mathrm{CuSO}_4 \rightarrow \mathrm{FeSO}_4 + \mathrm{Cu} \\
Fe + CuSO 4 ā ā FeSO 4 ā + Cu ā¢ Iron is oxidized from
to
F e 2 + . \mathrm{Fe^{2+}}. \\
F e 2 + . Option 2: Formation of
F e ( C O ) 5 \mathrm{Fe(CO)}_5 Fe ( CO ) 5 ā from Fe.
ā¢ In this process, iron reacts with carbon monoxide (CO) to form iron pentacarbonyl.
ā¢ The reaction is:
F e + 5 C O ā F e ( C O ) 5 \mathrm{Fe} + 5\mathrm{CO} \rightarrow \mathrm{Fe(CO)}_5 \\
Fe + 5 CO ā Fe ( CO ) 5 ā ā¢ Iron remains in the zero oxidation state (Fe
) in
F e ( C O ) 5 . \mathrm{Fe(CO)}_5. \\
Fe ( CO ) 5 ā . ā¢ Therefore, there is no oxidation of iron.
Option 3: Liberation of
from steam by iron at high temperature.
ā¢ In this process, iron reacts with steam to produce hydrogen gas and iron oxide.
ā¢ The reaction is:
3 F e + 4 H 2 O ā F e 3 O 4 + 4 H 2 3\mathrm{Fe} + 4\mathrm{H}_2\mathrm{O} \rightarrow \mathrm{Fe}_3\mathrm{O}_4 + 4\mathrm{H}_2 \\
3 Fe + 4 H 2 ā O ā Fe 3 ā O 4 ā + 4 H 2 ā ā¢ Iron is oxidized from
to
F e 3 + . \mathrm{Fe^{3+}}. \\
F e 3 + . Option 4: Rusting of iron sheets.
ā¢ Rusting involves the oxidation of iron in the presence of oxygen and moisture.
ā¢ The reaction is:
4 F e + 3 O 2 + 6 H 2 O ā 4 F e ( O H ) 3 4\mathrm{Fe} + 3\mathrm{O}_2 + 6\mathrm{H}_2\mathrm{O} \rightarrow 4\mathrm{Fe(OH)}_3 \\
4 Fe + 3 O 2 ā + 6 H 2 ā O ā 4 Fe ( OH ) 3 ā ā¢ Iron is oxidized from
to
F e 3 + . \mathrm{Fe^{3+}}. \\
F e 3 + . Conclusion:
ā¢ Option 2, the formation of
F e ( C O ) 5 \mathrm{Fe(CO)}_5 Fe ( CO ) 5 ā from Fe, does not involve oxidation of iron.
ā¢ Therefore, the correct option is 2.