Question detail
In Test for carbon dioxide, 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. To provide a source of oxygen for the reaction
- B. To dissolve chlorine gas for the bleaching reaction
- C. To prevent the paper from burning
- D. To allow hydrogen to react with the paper
Answer
The correct answer is To dissolve chlorine gas for the bleaching reaction. It matches hydrogen gas because the evidence is lighted splint and the expected result is squeaky pop.
Explanation
The correct option is To dissolve chlorine gas for the bleaching reaction. 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 test for carbon dioxide with the tests for hydrogen and oxygen.
Remember that carbon dioxide is tested using limewater, while hydrogen is tested with a lighted splint and oxygen with a glowing splint.
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