Question detail
For Purity, formulations and chromatography, which option uses the correct Chemical analysis evidence for pure substance?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Purity, formulations and chromatography
Question
- A. They increase the boiling point.
- B. They decrease the boiling point.
- C. They have no effect on the boiling point.
- D. They cause the boiling point to fluctuate.
Answer
The correct answer is They increase the boiling point.. It matches pure substance because the evidence is single element or compound / fixed melting point and the expected result is purity evidence.
Explanation
The correct option is They increase the boiling point.. This response is stronger than the distractors because it keeps the test, observation, and interpretation in the correct order for pure substance. Other options are weaker when they confuse gas tests, flame colours, ion-test precipitates, chromatography evidence, or pure-substance/formulation wording.
Common mistake
Impurities and Melting/Boiling Points
Students often think that impurities only affect the boiling point of a substance, ignoring their impact on the melting point.
Remember that impurities can change both the melting point and boiling point of a substance, causing them to be lower than those of the pure substance.
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