Question detail
For Identification of ions by chemical and spectroscopic means, which option uses the correct Chemical analysis 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. It turns clear
- B. It turns milky
- C. It changes to a blue color
- D. It produces a gas
Answer
The correct answer is It turns milky. 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 It turns milky. This response is stronger than the distractors because it keeps the test, observation, and interpretation in the correct order for carbonate ion. 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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