Question

observe the picture and explain it with a chemical equation:​

Answer 1

Explanation:

The rusting of iron is an oxidation process.The rust on iron is not formed by a simple reaction between oxygen and iron surface. The rust is formed by an electrochemical reaction. Fe oxidises to Fe2O3•H20 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 oxidized to Fe2+ in the anode region. Fe(S) ---] Fe2+ + 2e-
2. O2 is reduced to form water in the cathode region. O2+4H + 4e- ------] 2H2O

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

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

2Fe3+ + 4H2O -----] Fe2O3•H2O +6H...

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