Question detail
For Neutralisation of acids and salt production, which exam wording answer best supports this Unit 4.4 objective: Describe the test for carbon dioxide using limewater?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Reactions of acids
Question
- A. Using a lighted splint - correct exam wording for water
- B. Wrong exam wording: confuses water with a nearby Unit 4.4 chemical change idea
- C. Wrong particle check: uses the wrong ion, electrode, acid-base term, or product for Neutralisation of acids and salt production
- D. Wrong reaction link: does not support Describe the test for carbon dioxide using limewater
Answer
The correct option is Using a lighted splint - correct exam wording for water.
Explanation
The correct option is "Using a lighted splint - correct exam wording for water" because it supports the approved learning objective: Describe the test for carbon dioxide using limewater. The other options are incorrect or weaker because they are vague, use the wrong Chemistry context, or do not clearly explain the answer for Neutralisation of acids and salt production.
Common mistake
Common Mistake in Testing for Carbon Dioxide
Students often confuse the test for carbon dioxide with the test for hydrogen gas, thinking that a lighted splint is used for both tests.
Remember that the test for carbon dioxide involves bubbling the gas through limewater, which turns milky, while the test for hydrogen gas uses a lighted splint that produces a 'pop' sound.
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