1.

Which metal is used as a coating on steel to prevent corrosion where the cell reactions are:-

Answer»

Fe is oxidised to `Fe^(2+)` and issolved OXYGEN oxygen in water is reduced to `overset(Ө)(O)H`
Fe is oxidised to `Fe^(3+) and H_(2)O` is reduced to `O_(2)^(2-)`
Fe is oxidised to `Fe^(2+) and H_(2)O` is reduced to `O_(2)^(-)`
Fe is oxidised to `Fe^(2+) and H_(2)O` is reduced to `O_(2)`

Solution :`FetoFe^(2+)+2e^(-)` (anode reaction)
`O_(2)+2H_(2)O+4e^(-)to4OH^(-)` (cathode reaction) ltbgt The overall reaction is:-
`2Fe+O_(2)+2H_(2)Oto2FE(OH)_(2)`
`Fe(OH)_(2)` MAY be dehydrated to iron OXIDE FeO, or further oxidized to `Fe(OH)_(3)` and then dehydrate to iron RUST, `Fe_(2)O_(3)`.


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