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. Test for hydrogen.
- B. Test for carbon dioxide.
- C. Test for chlorine.
- D. Test for oxygen.
Answer
The correct answer is Test for oxygen.. It matches oxygen gas because the evidence is glowing splint and the expected result is relights.
Explanation
The correct option is Test for oxygen.. 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
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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