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Chemistry Question on Classical Idea Of Redox Reactions – Oxidation And Reduction Reactions

The number of electrons lost or gained during the change 3Fe+4H2O→Fe3O4+4H23Fe+4H_2O \rightarrow Fe_3O_4 + 4H_2 is

A

2

B

4

C

6

D

8

Answer

8

Explanation

Solution

Fe3O4=FeO+Fe2O3Fe_3O_4=FeO+Fe_2O_3 Therefore, the change can be represented as Fe−−−>Fe2++2e−Fe--->Fe^{2+}+2e^- 2Fe−−−−>2fe3++6e−2Fe---->2fe^{3+}+6e^- Number of electrons transferred = 8.