Question detail
A student is testing halide ion. Which choice keeps the observation and conclusion correctly linked?
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. The conclusion focus answer separates the observation from the conclusion drawn from it
- B. A vague answer that names Halide ions without a result or conclusion
- C. A swapped answer that uses a different test from the same unit
- D. A broad answer that describes quantitative measurement instead
Answer
The correct answer is The conclusion focus answer separates the observation from the conclusion drawn from it. It matches halide ion because the evidence is silver nitrate after acidifying and the expected result is precipitate colour.
Explanation
The correct option is The conclusion focus answer separates the observation from the conclusion drawn from it. The important distinction is that halide ion must be identified from silver nitrate after acidifying; answers that swap in a different test or result do not match Halide ions. Other options are weaker when they confuse gas tests, flame colours, ion-test precipitates, chromatography evidence, or pure-substance/formulation wording.
Common mistake
Confusing Halide Tests
Students often confuse the halide ion test with the sulfate ion test, leading to incorrect conclusions about the precipitate formed.
Correct this by using the approved Halide ions context: Describe the test for halide ions using silver nitrate 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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