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Corrosion

Account for t...

Question

Account for the following:
Iron on reaction with $H C l$ forms $F e C l_{2}$ and not $F e C l_{3}$ .

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Solution

Iron reacts with $H C l$ to form $F e C l_{2}$ and $H_{2}$

$F e + 2 H C l \to F e C l_{2} + H_{2}$

$H_{2}$ thus produced prevents the oxidation of $F e C l_{2}$ to $F e C l_{3}$ .

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