Which gas is usually liberated when an acid reacts with a metal illustrate with an example how will you test for the pressure of this gas?
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when acid react with to give h2 gas
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HEY FRIEND HERE IS UR ANSWER ,
When an acid react with a metal it liberates hydrogen gas.
E.g., Zn(s) + 2HCl(aq) ZnCl2 (aq) + H2(g)
To test the presence of H2 gas, bring a burning splinter near the mouth of the test tube where H2 gas is released, the match stick bums with a pop sound.
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