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Catalytic Hydrogenation

when HCL reac...

Question

when HCL react with finely powdered iron ,it forms ferrous chloride not ferric chloride. why?

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Solution

The hydrogen gas liberated on reaction of iron with HCl reduces any ferric chloride formed to ferrous chloride.

6HCl + 2Fe $\to$ 2FeCl₃ + 3H₂

2FeCl₃ + H₂ $\to$ 2HCl + 2FeCl₂

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