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 turns limewater clear
- B. It turns limewater milky
- C. It produces a squeaky pop
- D. It relights a glowing splint
Answer
The correct answer is It turns limewater milky. It matches carbon dioxide because the evidence is limewater and the expected result is turns milky.
Explanation
The correct option is It turns limewater milky. 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
Misunderstanding the Milky Appearance
Students often state that the milky appearance in limewater is due to the color change rather than the formation of a solid precipitate.
Students should remember that the milky appearance is specifically caused by the formation of calcium carbonate precipitate when carbon dioxide reacts with limewater.
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