Question

name the gas which is liberated when an acid reacts with a metal illustrate with an example how will you test the presence of this gas

Answer 1

hydrogen gas
for example H2SO4+Na= Na2SO4+H
the presence can be tasted by using matching which produces pop-up sound when burned in the presence of hydrogen gas

Answer 2

Hey there !

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The answer is as follows :-

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

Example :

Mg + HCl ――――> MgCl₂ + H₂ Î

       (dilute)

When Magnesium and dilute Hydrochloric acid react, a precipitate of magnesium chloride is formed and colourless, odourless gas is released which burns with a pale blue flame and extinguishes with a pop sound which means that the gas is hydrogen.

The bold lines in the above mentioned paragraph tell about the test for hydrogen.

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Hope it helps :-)