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. A lighted splint gives a squeaky pop
- B. A glowing splint relights
- C. Limewater turns milky
- D. Damp blue litmus paper is bleached
Answer
The correct answer is 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 A 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
Common Mistake in Hydrogen Test
Students often confuse the test for hydrogen with the test for oxygen, thinking both use a lighted splint.
Remember that the hydrogen test specifically uses a lighted splint to produce a squeaky pop, while the oxygen test uses a glowing splint to relight.
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