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. Introduce a glowing splint into the gas sample
- B. Add the gas to limewater and observe for milky appearance
- C. Introduce a lighted splint into the gas sample
- D. Dampen litmus paper and expose it to the gas
Answer
The correct answer is Introduce a lighted splint into the gas sample. It matches hydrogen gas because the evidence is lighted splint and the expected result is squeaky pop.
Explanation
The correct option is Introduce a lighted splint into the gas sample. 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 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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