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How Do Metal React with Solution of Other Metal Salts

If we put a s...

Question

If we put a steel spoon in a jar and jar contains a very sour lemon pickle and then the spoon(white colour) converts into (black colour) so what is the chemical effect

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Solution

A chemical reaction occurs between the steel (iron and its oxide) and the HCl present in the pickle.
Fe + Fe₂O₃ + 6HCl → 3FeCl₂ + 3H₂O

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