Question detail
Which answer avoids confusing hydrogen 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. ember evidence: lighted splint gives a squeaky pop
- B. ember distractor: an observation from a different test is used
- C. ember distractor: the answer gives a conclusion without evidence
- D. ember distractor: the response describes a measurement rather than identification
Answer
The correct answer is ember evidence: lighted splint gives a squeaky pop. It matches hydrogen gas because the evidence is lighted splint and the expected result is squeaky pop.
Explanation
The correct option is ember evidence: lighted splint gives a squeaky pop. Use this as an exam check: if the observation is not squeaky pop, the conclusion about hydrogen 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 Gas Tests
Students often confuse the test for carbon dioxide with the tests for hydrogen and oxygen.
Remember that carbon dioxide is tested using limewater, while hydrogen is tested with a lighted splint and oxygen with a glowing splint.
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