Question detail
In Test for carbon dioxide, which answer best matches the 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. A lighted splint gives a squeaky pop
- B. A glowing splint relights
- C. Limewater turns milky
- D. Damp blue litmus paper is bleached
Answer
The correct answer is Limewater turns milky. It matches carbon dioxide because the evidence is limewater and the expected result is turns milky.
Explanation
The correct option is Limewater turns milky. This is correct because limewater is the evidence expected for carbon dioxide, and turns milky is the result that supports the conclusion. 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.
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.