Question

How will you test for a gas which is liberated when hydrochloric acid react with an active Metal???

Answer 1

When HCl reacts with any metal then it forms metal salts and liberate hydrogen gas.
So, We can test the presence of H2 gas by burning a matchstick near it and if it burns with a pop sound then it is H2 gas.

Answer 2

•To test a gas when hcl reacts with metal is to bring burning matchstick near it. If it produces pop sound, then the gas evolved is Hydrogen.

Hope it helps u...