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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?

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

Take few pieces of zinc granules and add 5 ml of dilute H2SO4. 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.
`underset("zinc")ubrace(Zn) +underset("sulphuric Acid")ubrace(2H_(2)SO_(4))to underset("sodium Hydroxide ")ubrace(Zn(SO_(4))_(2))+underset(2H_(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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