Question detail
In Test for chlorine, which answer best matches the evidence for hydrogen gas?
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. forensic label chain-of-evidence: a lighted splint gives a squeaky pop
- B. forensic label reject: a method from a different Chemical analysis subtopic is used
- C. forensic label reject: the conclusion is stated before any observation is given
- D. forensic label reject: the answer measures quantity rather than identifying the substance
Answer
The correct answer is forensic label chain-of-evidence: a 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 forensic label chain-of-evidence: a lighted splint gives a squeaky pop. This is correct because lighted splint is the evidence expected for hydrogen gas, and squeaky pop is the result that supports the conclusion. 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 chlorine test with the hydrogen test, thinking both involve a color change.
Remember that the chlorine test uses damp litmus paper that bleaches, while the hydrogen test produces a squeaky pop with a lighted splint.
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