First slide

Corrosion

Question

Formation of rust is an electrochemical phenomenon. Formula of rust is

Easy

A

${Fe}_{3} O_{4} . {xH}_{2} O$
B

${Fe}_{2} O_{3} . {xH}_{2} O$
C

$FeO . {xH}_{2} O$
D

${Fe}_{3} O_{4}$

Solution

$Fe \to {Fe}^{+ 2} + 2 \bar{e} . {Fe}^{+ 2} formed at anodic site on the surface of Iron oxidizes to {Fe}^{+ 3} in presence atmospheric oxygen to form {Fe}_{2} O_{3} . {xH}_{2} O (a red layer)$

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