A) Rusting of iron sheets
B) Decolourisation of blue \[CuS{{O}_{4}}\] solution by iron
C) Formation of \[Fe{{(CO)}_{5}}\] from Fe
D) Liberation of Hg from steam by iron a high temperature
Correct Answer: C
Solution :
(a) \[\overset{0}{\mathop{Fe}}\,+\underbrace{{{H}_{2}}O+{{O}_{2}}}_{\text{from}\,\,\text{air}}\xrightarrow{\,}\overset{\text{III}}{\mathop{F{{e}_{2}}}}\,{{O}_{3}}.x{{H}_{2}}O]\] (b) \[\overset{0}{\mathop{Fe}}\,+CuS{{O}_{4}}\xrightarrow{\,}\overset{\text{III}}{\mathop{Fe}}\,S{{O}_{4}}+Cu\] (c) \[\overset{0}{\mathop{Fe}}\,+5CO\xrightarrow{\,}\overset{0}{\mathop{Fe}}\,{{\left( CO \right)}_{5}}\] (d) \[\overset{0}{\mathop{Fe}}\,+\underset{Steam}{\mathop{{{H}_{2}}O}}\,\xrightarrow{\,}\overset{III}{\mathop{Fe}}\,{{O}_{3}}+{{H}_{2}}\] \[\therefore \] Formation of \[Fe{{\left( CO \right)}_{5}}\] from Fe does not involve oxidation of iron because there is no change in oxidation state.
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