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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 a few pieces of zinc granules and add 5ml of dilute `H_2SO_4` shake it and pass the gas produced in to a soap solutions The bubbles of the soap solutions are formed . These soap bubbles contains Hydrogen gas.
`H_2SO_4 +Zn to ZnSO_4 H_2 uparrow`
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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