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. White precipitate
- B. Green precipitate
- C. Blue precipitate
- D. Yellow precipitate
Answer
The correct answer is White precipitate. 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 White precipitate. 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
Confusing Tests for Anions
Students often confuse the tests for carbonate ions with those for sulfate and halide ions, leading to incorrect conclusions about the presence of ions in unknown compounds.
Correct this by using the approved Required practical: identifying ions context: Use carbonate, sulfate and halide tests to identify negative ions in unknown compounds. 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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