Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Which gas is liberated when a metal reacts with an acid? How will you test the presence of this gas?

Answer 1

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hydrogen gas is formed. Bring a burning matchstick near to it, ${\text{H}}_2$will burn explosively with ‘pop’ sound.