Question detail
For Identification of common gases, which option uses the correct Chemical analysis evidence for chlorine gas?
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 common gases
Question
- A. To enhance the color change
- B. To allow chlorine to react
- C. To prevent the paper from burning
- D. To make the test easier
Answer
The correct answer is To allow chlorine to react. It matches chlorine gas because the evidence is damp litmus paper and the expected result is bleaches.
Explanation
The correct option is To allow chlorine to react. This response is stronger than the distractors because it keeps the test, observation, and interpretation in the correct order for chlorine gas. Other options are weaker when they confuse gas tests, flame colours, ion-test precipitates, chromatography evidence, or pure-substance/formulation wording.
Common mistake
Confusing Chlorine Test with Other Tests
Students often confuse the test for chlorine with tests for hydrogen, oxygen, and carbon dioxide, leading to incorrect interpretations of results.
To fix this, students should focus on the specific observation of damp litmus paper bleaching, which is unique to chlorine, and practice distinguishing it from the other gas tests.
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