Wich type of film formed after dipping metal in hydrochloric acid.
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Hydrochloric acid dissolves a few metals to form oxidized metal chlorides and hydrogen gas, the latter of which is visible in the form of bubbles floating to the surface.
Oxide films may be formed on the surface in case of few metallic substances like aluminium rods etc. coated with chromate which forms an orange-coloured film.
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