Question

List three advantage of rusting

Answer 1

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Rusting of silver -

2Ag + S gives Ag2S
( Black )

( tarnishing of silver )


Aluminium -


4Al + 3O2 gives 2 Al2O3 ...


it is beneficial for us because layers of aluminium oxide prevents further corrosion.


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Answer 2

Protection : Surface corrosion forms an oxide layer which further protects the inner metal form corrosion.

Corrosion prevents corrosion : Some metals like zinc are used as sacrificial anodes to prevent corrosion to other metal.

Galvanic corrosion : The principle on which primary batteries work. In which one metal corrodes preferentially to another when both metals are in electrical contact, in the presence of an electrolyte.