Question

please solve these....​

Answer 1

$\large\underline\mathfrak\red{Answer \: :- }$

1) The given picture shows the process of rusting of iron.

2) The rust is formed by an electron chemical reaction. Different regions on the surface of iron become anode and cathode.

3) Anode reaction : Fe is oxidised to Fe2+ in the anode region.

$\sf{Fe → Fe {}^{2 + } + 2 {}^{e - } }$

4) Cathode reaction

O2 is reduced to form water in the cathode region

$\sf{O_2+4H +4e {}^{ - } → 2H_2O}$

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

$\sf{Fe {}^{2 + } \: oxidised → Fe {}^{3 + } }$

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

$\sf{2Fe {}^{3 + } +4H_2O \: \: oxidised → Fe_2O_3+H_2O+6H {}^{ + } }$

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