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. Chlorine bleaches damp litmus paper
- B. Hydrogen burns with a squeaky pop
- C. Chlorine turns limewater milky
- D. Oxygen relights a glowing splint
Answer
The correct answer is Chlorine bleaches damp litmus paper. It matches hydrogen gas because the evidence is lighted splint and the expected result is squeaky pop.
Explanation
The correct option is Chlorine bleaches damp litmus paper. 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 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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