Question

Q2.  How will you test for the gas which is liberated when HCL reacts with an active metal?​

Answer 1

When Hydrochloric acid reacts with an active metal (like zinc), we observe that gas filled bubbles are formed on the surface of the metal. ... Then, bring a burning candle near the gas filled soap bubble. If the gas present in bubble burns with a 'pop' sound, then its hydrogen gas.

Answer 2

Answer:

Hydrogen gas is liberated whenever a metal reacts with an acid.So if HCl will react with an active metal then also Hydrogen would be liberated.So to test its presence you will have to bring a matchstick near it and if the matchstick burns with a pop sound and a pale blue flame then the gas present is Hydrogen.