Answer:
[tex]Fe_{2}O_{3}+3CO\rightarrow 2Fe+3CO_{2}[/tex] is an oxidation-reduction reaction.
Explanation:
In an oxidation-reduction reaction, the oxidation number of some elements must change during reaction.
[tex]Fe_{2}O_{3}+3CO\rightarrow 2Fe+3CO_{2}[/tex] represents an oxidation-reduction reaction.
oxidation number
Fe in [tex]Fe_{2}O_{3}[/tex] +3
Fe in Fe 0
C in CO +2
C in [tex]CO_{2}[/tex] +4
SO, oxidation number of Fe decreases during reaction. Hence [tex]Fe_{2}O_{3}[/tex] is being reduced. Also, oxidation number of C increases during reaction. Hence CO is being oxidized.
In all other given reactions, oxidation number of elements are not changed during reaction. Hence they are not oxidation-reduction reaction.
