CAIE IGCSE Chemistry 12.5.3 Gas Tests Nh3 with Damp Red Litmus Questions
Work through real CAIE IGCSE Chemistry questions to identify gases from litmus, limewater, splint and manganate observations.
- Syllabus
- 2026–2028
- Course
- Chemistry 0620
Exam points
- test ammonia with damp red litmus paper, which turns blue
- test carbon dioxide with limewater, which turns milky
- test chlorine with damp litmus, which is bleached, and hydrogen with a lighted splint, which gives a pop
- test oxygen with a glowing splint that relights and sulfur dioxide with acidified potassium manganate(VII), which decolourises
CAIE IGCSE Chemistry 12.5.3 Gas Tests Nh3 with Damp Red Litmus Questions question 1
[Maximum number: 2]
When iron(II) sulfate crystals are heated strongly, sulfur dioxide gas is given off.
Describe a test for sulfur dioxide gas.
test
observations
M1 acidified aqueous potassium manganate(VII) (1)
M2 purple to colourless (1)
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