Question

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

Answer 1

➡️Hydrogen gas is usually liberated when an acid reacts with a metal

➡️Take few pieces of zinc granules and add 5 ml of dilute H2SO4.

➡️Shake it and pass the gas produced into a soap solution. The bubbles of the soap solution are formed.

❤️CHEMISTRY❤️

Answer 2

Dear Student,

● Gas liberated -

Hydrogen gas is liberated when an acid reacts with a metal.

◆ For example -

When magnesium metal is treated with hydrochloric acid, magnesium chloride is formed and hydrogen gas is liberated.

Mg + 2 HCl --> MgCl2 + H2

● Testing of hydrogen -

• When hydrogen gas is exposed to air, it reacts with oxygen to form water vapor.
• So if lighted matchstick is taken near hydrogen gas, it will heat the molecules of water vapor and expand them.
• Some of the molecules burst while expanding which causes a pop sound.

Thank dear. Hope this helps you..