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. keystone evidence: the observation supports the conclusion
- B. keystone distractor: an observation from a different test is used
- C. keystone distractor: the answer gives a conclusion without evidence
- D. keystone distractor: the response describes a measurement rather than identification
Answer
The correct answer is keystone evidence: the observation supports the conclusion. It matches halide ion because the evidence is silver nitrate after acidifying and the expected result is precipitate colour.
Explanation
The correct option is keystone evidence: the observation supports the conclusion. 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
Bromide Precipitate Confusion
Students often confuse the precipitate produced by bromide ions with that of chloride ions, thinking both produce a white precipitate.
Remember that bromide ions produce a cream precipitate, while chloride ions produce a white precipitate. Visual aids or color charts can help reinforce this distinction.
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