Tests for gases

Question 1

Hydrogen (H₂)

Answer 1

Test: Hold a lit splint at the mouth of the test tube.
Result: Yuh hear a squeaky pop sound.

Question 2

Oxygen

Answer 2

Test: Insert a glowing splint (not flaming eh!) into the gas.
Result: The splint relights.

Question 3

Carbon dioxide

Answer 3

. Carbon Dioxide (CO₂)
Test: Bubble the gas through limewater (calcium hydroxide).
Result: Limewater turns milky/cloudy.

Question 4

Ammonia

Answer 4

Ammonia (NH₃)
Test 1: Smell it carefully – strong choking smell.
Test 2: Hold damp red litmus paper over the gas.
Result: Paper turns blue – it’s alkaline.

Question 5

Chlorine

Answer 5

Test 1: Smell – sharp, choking bleach scent
Test 2: Hold damp blue litmus paper
Result: It turns red first (acidic), then white (bleached)

Question 6

Sulfur dioxide

Answer 6

Test: Bubble gas into acidified potassium manganate(VII) solution (purple).
Result: Solution turns colourless.