Question

# Account for the following:Iron on reaction with HCl forms FeCl2 and not FeCl3.

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Solution

## Iron reacts with $\mathrm{HCl}$ to form ${\mathrm{FeCl}}_{2}$ and ${\mathrm{H}}_{2}$.$\mathrm{Iron}+\mathrm{Hydrochloric}\mathrm{acid}\to \mathrm{Iron}\mathrm{chloride}+\mathrm{Hydrogen}$i.e., $\mathrm{Fe}\left(\mathrm{s}\right)+2\mathrm{HCl}\left(\mathrm{aq}\right)\to {\mathrm{FeCl}}_{2}\left(\mathrm{aq}\right)+{\mathrm{H}}_{2}\left(\mathrm{g}\right)$The hydrogen gas which is produced in the reaction prevents the oxidation of ${\mathrm{FeCl}}_{2}$ to ${\mathrm{FeCl}}_{3}$.Thus, Iron on reaction with HCl forms FeCl2 and not FeCl3.

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