Question

which gas is usually liberated when an acid reacts with a metal? illustration with an example. how will you test for the presence of this gas

Answer 1

When acid reacts wit metal then the gas liberated is hydrogen(H).For test of presence of gas you can bring candle near it and you'lol listen a pop sound.
Thanks

Answer 2

Hydrogen gas is evolved

acid+metal => salt+hydrogen

example
nitric acid+ calcium=> calcium nitrate+hydrogen


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