Question detail
For Identification of ions by chemical and spectroscopic means, which option uses the correct Chemical analysis 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. A white precipitate indicates the presence of sulfate ions.
- B. A blue precipitate indicates the presence of sulfate ions.
- C. A yellow precipitate indicates the presence of sulfate ions.
- D. A green precipitate indicates the presence of sulfate ions.
Answer
The correct answer is A white precipitate indicates the presence of sulfate ions.. It matches sulfate ion because the evidence is barium chloride after acidifying and the expected result is white precipitate.
Explanation
The correct option is A white precipitate indicates the presence of sulfate ions.. This response is stronger than the distractors because it keeps the test, observation, and interpretation in the correct order for sulfate ion. 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.
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.