Question

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Answer 1

Answer :-

The rusting of iron is an oxidation process. The rust on iron does not form by a simple reaction between oxygen ans iron surface. Th rust is formed by an electrochemical reaction. Fe oxidises to Fe2O3. H2O on one part of iron surface while oxygen gets reduced to H2O in another part of surface. Different regions on the surface of iron become anode and cathode.

1) Fe is oxidised to Fe2+ in the anode region.

Fe (s) ➡️ Fe2+ (aq) + 2e-

2) O2 is reduced to form water in the cathode region.

O2 (g) + 4H+ (aq) 4e- ➡️ 2H2O (l)

When Fe2+ ions migrate from the anode region they react with water and further get oxidised to form Fe3+ ions.

A reddish coloured hydrated oxide is formed from Fe3+ ions. It is called rust. It collects on the surface.

2Fe3+ (aq) + 4H2O (l) ➡️ Fe2O3. H2O (s) + 6H+ (aq)

Because of various components of atmosphere, oxidation of metals takes place, consequently resulting in their damage. This is called 'corrosion'. Iron rusts and a reddish coloured layer is collected on it. This is corrosion of iron.

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