How do Acids, when they react with metals, always produce a salt along with hydrogen gas?

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Solution

This is not for all metal. The metal which are more reactive than hydrogen are reacting with acid and displaces hydrogen from the acid.
Zn + 2 HCl ----> ZnCl₂ + H₂

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Hydrogen gas is produced when metals reacts with acids.

Metal reacts with acid to produce hydrogen gas. But when metal reacts with $H N O_{3}$ hydrogen gas is not given out. Give a reason.

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