Question detail
Which answer avoids confusing halide ion with another qualitative analysis result?
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. Heat the sample to boiling point.
- B. Add dilute nitric acid to acidify the sample.
- C. Dilute the sample with water.
- D. Add sodium hydroxide solution to the sample.
Answer
The correct answer is Add dilute nitric acid to acidify the sample.. It matches halide ion because the evidence is silver nitrate after acidifying and the expected result is precipitate colour.
Explanation
The correct option is Add dilute nitric acid to acidify the sample.. Use this as an exam check: if the observation is not precipitate colour, the conclusion about halide ion is not properly supported. 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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