Question detail
For Identification of common gases, which option uses the correct Chemical analysis evidence for oxygen gas?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Identification of common gases
Question
- A. A lighted splint gives a squeaky pop
- B. A glowing splint relights
- C. Limewater turns milky
- D. Damp blue litmus paper is bleached
Answer
The correct answer is A glowing splint relights. It matches oxygen gas because the evidence is glowing splint and the expected result is relights.
Explanation
The correct option is A glowing splint relights. This response is stronger than the distractors because it keeps the test, observation, and interpretation in the correct order for oxygen gas. Other options are weaker when they confuse gas tests, flame colours, ion-test precipitates, chromatography evidence, or pure-substance/formulation wording.
Common mistake
Misinterpretation of Test Results
Students often confuse the glowing splint test for oxygen with the test for hydrogen, thinking both produce a similar sound.
Remember that a glowing splint relighting indicates oxygen is present, while a squeaky pop indicates hydrogen. Focus on the specific observations for each gas test.
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