Question detail
In Sulfate ions, which answer best matches the evidence for sulfate 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. BaSO4
- B. BaS
- C. BaO
- D. Ba(OH)2
Answer
The correct answer is BaSO4. It matches sulfate ion because the evidence is barium chloride after acidifying and the expected result is white precipitate.
Explanation
The correct option is BaSO4. This is correct because barium chloride after acidifying is the evidence expected for sulfate ion, and white precipitate 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
Misidentifying barium sulfate as a different precipitate
Students often think the white precipitate formed with acidified barium chloride is due to a different ion, such as chloride or nitrate, rather than recognising it as barium sulfate indicating sulfate ions.
Correct this by using the approved Sulfate ions context: Interpret a white precipitate with acidified barium chloride solution as evidence for sulfate 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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