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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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When a metal reacts with an acid , usually hydrogen gas is liberated . For example , zinc reacts with dilute sulphuric acid as follows :
`underset("Zinc")(ZN)+underset("Sulphuric acid")(H_2SO_4)rarrunderset("Zinc sulphate")(ZnSO_4)+underset("Hydrogen")(H_2)`
The hydrogen evolved can be tested by passing the gas through soap solution and then bringing a burning candle near the soap bubble filled with the gas. The soap bubble bursts and the hydrogen gas burns with a pop sound.
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