Question detail
Which answer avoids confusing oxygen gas with another qualitative analysis result?
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. The splint extinguishes.
- B. The splint relights.
- C. The splint burns out quickly.
- D. The splint produces smoke.
Answer
The correct answer is The splint relights.. It matches oxygen gas because the evidence is glowing splint and the expected result is relights.
Explanation
The correct option is The splint relights.. Use this as an exam check: if the observation is not relights, the conclusion about oxygen gas is not properly supported. 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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