Question

During the chemical reaction between dil.HCl and zinc metal as gas is evolved .How the presence of the gas can be determined

Answer 1

Hydrogen gas is evolved and it can be determined by bringing a burning matchstick which burns with a pop sound

Answer 2

If hydrogen gas is evolved and if you hear a pop sound on putting a matchstick of over evaporated Hydrogen then presence of Hydrogen is confirmed in the above given reaction