Question detail
In Carbonate ions, which answer best matches the evidence for carbonate ion?
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. Effervescence is observed if carbonate ions are present
- B. The test is qualitative, not quantitative
- C. The test requires a small sample size
- D. The test produces a coloured flame
Answer
The correct answer is The test produces a coloured flame. It matches carbonate ion because the evidence is acid then limewater and the expected result is carbon dioxide is produced.
Explanation
The correct option is The test produces a coloured flame. This is correct because acid then limewater is the evidence expected for carbonate ion, and carbon dioxide is produced 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
Common Mistake in Carbonate Ion Test
Students often forget to mention that effervescence occurs when carbonate ions react with dilute acid.
Always include that effervescence is a key observation indicating the presence of carbonate ions when they react with dilute acid.
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