Which gas is usually liberated when an acid reacts with a metal?... or How to convert rusted iron...

Описание к видео Which gas is usually liberated when an acid reacts with a metal?... or How to convert rusted iron...

Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?
OR
How to convert rusted iron to unrusted iron.

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Alan Walker - Faded (Instrumental Version)
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