Which gas is usually liberated when an acid reacts with metal? how will you test for the presence of this gas?

Answers (1)

Hydrogen gas is liberated when an acid reacts with a metal.

For example, when zinc metal reacts with dil. hydrogen is evolved and salt zinc chloride is formed. And it can be tested by bringing a burning candle near the gas, you will see that the flame extinguishes with a pop sound.

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