Question

which gas usuall libetated where an acid reacts with a metal?illustrate with example. how will you test for the presence of this gas?

Answer 1

H2 librate when acids reacts with metals

H2SO4+Mg->MgSO4 + H2

burning candle test...

Answer 2

Hey...Hydrogen gas usually libetated where an acid reacts with a metal...To test for hydrogen gas evolved, insert a lighted splint into the test tube. The lighted splint should extinguish with a characteristic "pop" sound...