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Which gas is usually liberated when an a...

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?

Text Solution

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Hydrogen gas is usually liberated when an acid

(i) Take few pieces of zinc granules in a test tube and add 5 ml of dilute `H_(2)SO_(4)`.
(ii) Shake it and pass the gas produced into a soap solution. The bubbles of the soap solution are formed. These soap bubbles contain hydrogen gas.
`Zn + H_(2)SO_(4) rarr ZnSO_(4) + H_(2)`
We can test the evolved hydrogen gas by its burning with a pop sound when a candle is brought near the soap bubbles.
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