How do metals react with acid …

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Metals react with acids to produce hydrogen gas. If a matchstick is brought near the mouth of the tube containing the product of the reaction then we hear a pop sound. It is this hydrogen gas that burns with a pop sound.

• For instance, Magnesium reacts with dilute hydrochloric acid to form magnesium chloride and hydrogen.

• Copper does not react with hydrochloric acid but reacts with sulphuric acid.