Chapter 2: Acids, Bases and Salts

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Acids,Bases, and Salts

Question:

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?

Answer:

When a metal reacts with an acid, metal salt will form along with the evolution of hydrogen gas. For example, when zinc metal reacts with hydrochloric acid, zinc chloride will form along with the evolution of hydrogen gas.

Zn (s) + 2HCl (aq) → ZnCl2 (s) + H2 (g)

The presence of this gas is confirmed by bringing a candle near it. The hydrogen gas burns with a pop sound.


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