Question detail
A student is testing oxygen gas. Which choice keeps the observation and conclusion correctly linked?
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. It must be soaked in water
- B. It must be glowing
- C. It must be extinguished
- D. It must be lit with a match
Answer
The correct answer is It must be glowing. It matches oxygen gas because the evidence is glowing splint and the expected result is relights.
Explanation
The correct option is It must be glowing. The important distinction is that oxygen gas must be identified from glowing splint; answers that swap in a different test or result do not match Test for oxygen. 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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