Question detail
A student is testing hydrogen 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. The splint extinguishes
- B. The splint glows brightly
- C. A squeaky pop occurs
- D. The splint burns steadily
Answer
The correct answer is A squeaky pop occurs. It matches hydrogen gas because the evidence is lighted splint and the expected result is squeaky pop.
Explanation
The correct option is A squeaky pop occurs. The important distinction is that hydrogen gas must be identified from lighted splint; answers that swap in a different test or result do not match Test for hydrogen. Other options are weaker when they confuse gas tests, flame colours, ion-test precipitates, chromatography evidence, or pure-substance/formulation wording.
Common mistake
Misinterpreting the Squeaky Pop
Students often think that the squeaky pop sound indicates the presence of oxygen instead of hydrogen.
Remember that the squeaky pop is a specific characteristic of hydrogen burning; focus on the fact that hydrogen is the only gas that produces this sound when ignited.
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