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Corrosion of iron is essentially an elec...

Corrosion of iron is essentially an electrochemical phenomenon where the cell reactions are

A

Fe is oxidised to `Fe^(2+)` and dissolved oxygen in water is reduced to `OH^(-)`

B

(b) Fe is oxidised to `Fe^(3+)` and `H_(2)O` is reduced to `O_(2)^(2-)`

C

Fe is oxidised to `Fe^(2+)` and `H_(2)O` is reduced to `O_(2)^(-)`

D

Fe is oxidised to `Fe^(2+)` and `H_(2)O` is reduced to `O_(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
(a) Al anode : `Fe to Fe^(2+)+2e^(-)xx2`.
`("Al cathode" : O_(2)+2H_(2)O+4e^(-) to 4OH^(-))/("Overall reaction" , 2Fe+O_(2)+2H_(2)O to 2Fe(OH)_(2))`
`:.` It is the correct option.
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