Question detail
In Test for oxygen, which answer best matches the 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. To ensure it can extinguish.
- B. To indicate the presence of carbon dioxide.
- C. To show it is hot enough to relight.
- D. To prevent it from burning out.
Answer
The correct answer is To show it is hot enough to relight.. It matches oxygen gas because the evidence is glowing splint and the expected result is relights.
Explanation
The correct option is To show it is hot enough to relight.. This is correct because glowing splint is the evidence expected for oxygen gas, and relights is the result that supports the conclusion. Other options are weaker when they confuse gas tests, flame colours, ion-test precipitates, chromatography evidence, or pure-substance/formulation wording.
Common mistake
Confusing Oxygen and Hydrogen Tests
Students often confuse the tests for oxygen and hydrogen, stating that hydrogen relights a glowing splint instead of oxygen.
Correct this by using the approved Test for oxygen context: Recall that oxygen relights a glowing splint. Name the correct test or chemistry idea, state the observation accurately, and then give the conclusion supported by that evidence. Do not swap gas tests, flame tests, cation tests, anion tests, chromatography terms, pure substances, and formulations.
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