4 Tests for gases.

Question 1

Test for chlorine?

Answer 1

Bleaches damp litmus paper, turning it white.

Question 2

Test for oxygen?

Answer 2

If you put a glowing split inside a test tube containing oxygen, oxygen will relight glowing splint.

Question 3

Test for CO2?

Answer 3

Bubbling gas though a solution of calcium hydroxide.
If the gas is carbon dioxide, solution will turn cloudy.

Question 4

Test for hydrogen?

Answer 4

Hold a lot split at the open end of a test tube, you’ll get a squeaky pop if contains hydrogen.