Question detail
A student is testing carbonate ion. Which choice keeps the observation and conclusion correctly linked?
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. To identify the color of the gas produced
- B. To ensure the gas is not hydrogen
- C. To verify the gas produced is carbon dioxide
- D. To determine the acidity of the solution
Answer
The correct answer is To verify the gas produced is carbon dioxide. 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 To verify the gas produced is carbon dioxide. The important distinction is that carbonate ion must be identified from acid then limewater; answers that swap in a different test or result do not match Carbonate ions. Other options are weaker when they confuse gas tests, flame colours, ion-test precipitates, chromatography evidence, or pure-substance/formulation wording.
Common mistake
Misinterpreting Effervescence
Students often confuse the effervescence produced by carbonate ions with other gas reactions, leading to incorrect conclusions about the presence of carbonate ions.
Correct this by using the approved Carbonate ions context: Interpret effervescence and limewater turning milky as evidence for carbonate ions. Name the correct test or chemistry idea, state the observation accurately, and then give the conclusion supported by that evidence. Do not swap gas tests, flame tests, cation tests, anion tests, chromatography terms, pure substances, and formulations.
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