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. To increase the temperature of the reaction
- B. To prevent the formation of insoluble carbonates
- C. To enhance the color of the precipitate
- D. To dilute the sample for better results
Answer
The correct answer is To prevent the formation of insoluble carbonates. It matches sulfate ion because the evidence is barium chloride after acidifying and the expected result is white precipitate.
Explanation
The correct option is To prevent the formation of insoluble carbonates. 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
Acidification Step Confusion
Students often forget to acidify the sample before adding barium chloride solution, leading to incorrect results.
Correct this by using the approved Sulfate ions context: Explain that the sample is acidified before adding barium chloride solution. 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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