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 reacts with a metal.
Take few pieces of zinc granules in a test tube and add 5 ml of diliute HCl. Shake it well. Tiny bubbles rise up in the solution. Pass this gas produced into a soap solution. Soap bubbles are formed. These soap bubbles contain gas.
We can test if the gas evolved is hydrogen gas by bringing a burning splint near the soap bubble. The gas in the bubble burns with a pop sound proving that the gas is Hydrogen.

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