Question

which has is usually liberated when an acid reacts with a metal ? How will you test for the presence of this gas ?

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Answer 1

Question:

which has is usually liberated when an acid reacts with a metal ? How will you test for the presence of this gas ?

Answer:

• When acid reacts with metal, hydrogen gas is evolved

• When we bring a burning match stick or candle to the mouth of the delivery tube, it produces a pop sound

Answer 2

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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.