Tests for gases:

Question 1

Ammonia:

Answer 1

damp red litmus blue

Question 2

Carbon dioxide:

Answer 2

Bubble through limewater to produce a milky solution

Question 3

Chlorine:

Answer 3

Damp blue litmus red

Question 4

Hydrogen:

Answer 4

makes a squeaky pop sound when a lighted splint is held in gas

Question 5

Oxygen:

Answer 5

Glowing splint relights

Question 6

Sulphur dioxide:

Answer 6

turns acidified aqueous potassium manganate (vii) from purple to colorless