Question

Which gas is usually liberated when an acid reacts with a metal is used with an example how will you test for the process of the gas?

Answer 1

when metal react with acid the gas which is liberated is HYDROGEN.
to check the presence of hydrogen gas, bring a burning candle near to the liberating gas, it will produce a pop sound, which is used to identify the presence of hydrogen gas.
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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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