Question detail
Which of the following tests can be used to identify chloride ions?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
AS practical skills and required practical activities
Question
- A. Add silver nitrate.
- B. Add barium chloride.
- C. Add dilute sulfuric acid.
- D. Add sodium hydroxide.
Answer
Add silver nitrate.
Explanation
The correct option is Add silver nitrate.. Add silver nitrate. is the best answer because it directly supports the AQA A-Level Chemistry objective to required practical 4: identify required cations and anions using test-tube reactions. This reasoning is anchored to AS required practical activities in AS practical skills and required practical activities, and it separates required practical from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.
Common mistake
Identifying Cations Incorrectly
Students often confuse the tests for different cations, leading to incorrect identification.
To correctly identify cations, remember the specific reagents and expected precipitate colors. For example, when adding sodium hydroxide to a solution containing copper(II) ions, the expected observation is a blue precipitate of copper(II) hydroxide. Use the formula: cation test = reagent + solution -> observation. Substitute with the correct cation and reagent to ensure accurate results.
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