Question detail
Which technique would you use to separate a mixture of liquids with different boiling points?
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. Distillation
- B. Filtration
- C. Chromatography
- D. Titration
Answer
Distillation
Explanation
The correct option is Distillation. Distillation is the best answer because it directly supports the AQA A-Level Chemistry objective to use heating, titration, distillation, filtration and chromatography techniques. This reasoning is anchored to AS apparatus and techniques in AS practical skills and required practical activities, and it separates titration 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
Incorrect Titration Technique
Students often forget to record the initial and final burette readings accurately during a titration, leading to incorrect volume calculations.
To fix this, always note the initial reading before starting the titration and the final reading after the endpoint is reached. Use the formula: volume of titrant used = final reading - initial reading. For example, if the initial reading is 10.0 mL and the final reading is 25.0 mL, then: 25.0 mL - 10.0 mL = 15.0 mL. Therefore, the volume of titrant used is 15.0 mL.
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