Question detail
Which statement would earn credit for Explain that the sample is acidified before adding barium chloride solution.?
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 enhance the color of the precipitate
- B. To remove impurities from the sample
- C. To ensure accurate results by preventing interference
- D. To increase the solubility of the sulfate ions
Answer
The correct answer is To ensure accurate results by preventing interference. 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 ensure accurate results by preventing interference. The answer stays inside Identification of ions by chemical and spectroscopic means by linking the observation to the conclusion instead of naming a substance without evidence. 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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