1.

Corrosionof iron is essentially an electrochemical phenomeonon where the cell reaction are

Answer»

Fe is oxidised to `Fe^(3+)` and `H_(2)O` is REDUCED to `O_(2)^(2-)`
Fe isoxidised to `Fe^(2+)` and `H_(2)O` is reduced to `O_(2)^(2-)`
Fe is oxidisedto `Fe^(2+)`and `H_(2)O` is reduced to `O_(2)`
Fe is oxidised to `Fe^(2+)` and `H_(2)O`is reducedto `O_(2)`

SOLUTION :`Fe rarr Fe^(2+) +2E^(-)`
`O_(2) +2H_(2)O+4e^(-) rarr 4OH^(-)`
The overallreaction is
`2Fe+O_(2) +2h_(2) rarr2Fe(OH)_(2)`
`Fe(OH)_(2)` may be dehydrated to iron oxide FeO or furtheroxidisedto `Fe(OH)_(3)` and then dehydrated to ironrust`Fe_(2)O_(3)`


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