Question

Which gas is usually liberated whenas acid reacts with a metal? Illustrate with an example . How will you test for the presence of this gas?

Answer 1

Explanation:

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 as: It can be tested by bringing a burning candle near the gas.

Answer 2

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

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Take few pieces of zinc granules and add 5 ml of dilute H₂SO₄ and shake it. The gas produced is passed into a soap solution. The bubbles of soap solution are formed. These soap bubbles contain hydrogen gas. The reaction occurs as follows :

H₂SO₄ (aq.) + Zn (s) → ZnSO₄ (aq.) + H₂ (↑)

We can test the evolved hydrogen gas, as it burns with a pop sound when a candle is brought near the soap bubbles.

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