Which gas is usualy libertad when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?

Explanation

Hydrogen gas is usually liberated when an acid reacts with a metal. For example, when hydrochloric acid reacts with zinc metal, hydrogen gas is released.
`underset("Zinc")(Zn(s)) + underset("Hydrochloric acid")(2HCl(aq)) tounderset("Zinc chloride")(ZnCl_(2)(aq)) + underset("Hydrogen")(H_(2))`
This gas-is tested by passing it through the soap solution. When the soap bubbles filled with the gas comes out, bring a burning splinter near them. The bubbles filled with the gas bum with a pop sound. This indicates the presence of hydrogen gas.