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
- Name limewater as the reagent for testing carbon dioxide, or identify carbon dioxide when limewater is the stated test.
- Test chlorine with damp litmus paper and state that the paper is bleached or turns white.
- Test hydrogen with a lighted splint and state that a squeaky pop is heard.
- Test oxygen with a glowing splint and state that it relights, or identify oxygen from that observation.
- Test sulfur dioxide with acidified aqueous potassium manganate(VII) and state the colour change from purple to colourless.
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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