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. zephyr evidence: lighted splint gives a squeaky pop
- B. zephyr distractor: an observation from a different test is used
- C. zephyr distractor: the answer gives a conclusion without evidence
- D. zephyr distractor: the response describes a measurement rather than identification
Answer
The correct answer is zephyr 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 zephyr evidence: lighted splint gives a squeaky pop. 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
Confusing Gas Tests
Students often confuse the test for hydrogen with the tests for oxygen, carbon dioxide, and chlorine.
Review the specific characteristics of each gas test, focusing on the unique observations associated with hydrogen, such as the squeaky pop sound when tested with a lighted splint.
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