Question detail
A student is testing carbon dioxide. Which choice keeps the observation and conclusion correctly linked?
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 ions by chemical and spectroscopic means
Question
- A. It produces oxygen gas.
- B. It produces hydrogen gas.
- C. It produces carbon dioxide gas.
- D. It produces nitrogen gas.
Answer
The correct answer is It produces carbon dioxide gas.. It matches carbon dioxide because the evidence is limewater and the expected result is turns milky.
Explanation
The correct option is It produces carbon dioxide gas.. The important distinction is that carbon dioxide must be identified from limewater; answers that swap in a different test or result do not match Carbonate ions. Other options are weaker when they confuse gas tests, flame colours, ion-test precipitates, chromatography evidence, or pure-substance/formulation wording.
Common mistake
Confusing Carbonate Reaction
Students often think that carbonate ions react with dilute acid to produce water instead of carbon dioxide.
Remember that the reaction produces carbon dioxide gas, which can be confirmed by bubbling through limewater.
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