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 ions by chemical and spectroscopic means
Question
- A. Adding barium chloride
- B. Bubbling through limewater
- C. Adding silver nitrate
- D. Heating with sodium hydroxide
Answer
The correct answer is Bubbling through limewater. It matches carbon dioxide because the evidence is limewater and the expected result is turns milky.
Explanation
The correct option is Bubbling through limewater. 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 Limewater Reaction
Students often state that limewater turns milky due to the presence of carbon dioxide without mentioning the reaction with dilute acid first.
Emphasize that carbon dioxide must be produced by reacting carbonate ions with dilute acid before it can turn limewater milky.
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