Question detail
For Identification of common gases, which option uses the correct Chemical analysis evidence for carbon dioxide?
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. The limewater turns blue
- B. The limewater turns milky
- C. The limewater remains clear
- D. The limewater bubbles
Answer
The correct answer is The limewater turns milky. It matches carbon dioxide because the evidence is limewater and the expected result is turns milky.
Explanation
The correct option is The limewater turns milky. This response is stronger than the distractors because it keeps the test, observation, and interpretation in the correct order for carbon dioxide. Other options are weaker when they confuse gas tests, flame colours, ion-test precipitates, chromatography evidence, or pure-substance/formulation wording.
Common mistake
Confusing Tests for Gases
Students often confuse the test for carbon dioxide with the test for oxygen, forgetting that carbon dioxide turns limewater milky.
To fix this, remember that carbon dioxide is identified by its reaction with limewater, which turns milky, while oxygen is identified by relighting a glowing splint.
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