Simple Chemical Tests for Gases

The video tutorial explains how to test for various gases: hydrogen, oxygen, carbon dioxide, chlorine, and ammonia. Each gas has a specific test: hydrogen ignites with a squeaky pop, oxygen reignites a glowing splint, carbon dioxide turns lime water cloudy, chlorine turns blue litmus paper red before bleaching it, and ammonia turns red litmus paper blue. These tests help identify colorless and odorless gases quickly and easily.

What sound indicates the presence of hydrogen when using a splint?

• A hissing noise

• A squeaky pop

• A loud bang

• A crackling sound

Which gas will reignite a glowing splint?

• Ammonia

• Oxygen

• Chlorine

• Carbon dioxide

What happens to limewater when carbon dioxide is bubbled through it?

• It remains unchanged

• It turns cloudy

• It becomes clear

• It turns blue

How does chlorine affect damp blue litmus paper?

• Turns it blue

• Turns it red and then bleaches it

• Turns it green

• Leaves it unchanged

What color change occurs when ammonia is tested with damp red litmus paper?

• Blue to red

• No change

• Red to blue

• Red to green