Question detail
Which answer avoids confusing carbon dioxide 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. It changes color with oxygen
- B. It reacts to form a solid precipitate
- C. It absorbs carbon dioxide
- D. It produces a squeaky pop
Answer
The correct answer is It reacts to form a solid precipitate. It matches carbon dioxide because the evidence is limewater and the expected result is turns milky.
Explanation
The correct option is It reacts to form a solid precipitate. Use this as an exam check: if the observation is not turns milky, the conclusion about carbon dioxide 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 Tests for Gases
Students often confuse the test for carbon dioxide with the test for oxygen, forgetting that carbon dioxide turns limewater milky.
To fix this, remember that carbon dioxide is identified by its reaction with limewater, which turns milky, while oxygen is identified by relighting a glowing splint.
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