Chemistry Question & Answers
In addition to nitric acid, another acid which may render iron passive is
|A) acetic acid||B) oxalic acid|
|C) chromic acid||D) citric acid|
Passivity of iron is due to formation of an extremely thin and impervious film of ferrosoferric oxide on the surface of iron. Chromic acid, being a powerful oxidising agent (like nitric acid ) renders iron passive.
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