Question detail
What is the conclusion when a glowing splint is placed in a gas produced from a reaction of an acid with a carbonate?
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 ions in aqueous solution (A-level only)
Question
- A. The gas is carbon dioxide
- B. The gas is oxygen
- C. The gas is hydrogen
- D. The gas is nitrogen
Answer
The gas is carbon dioxide
Explanation
The correct option is The gas is carbon dioxide. The gas is carbon dioxide is the best answer because it directly supports the AQA A-Level Chemistry objective to required practical: carry out test-tube reactions to identify cations and anions. This reasoning is anchored to Aqueous ion tests (A-level only) in Reactions of ions in aqueous solution (A-level only), and it separates required from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.
Common mistake
Identifying Cations with Sodium Hydroxide
Students often incorrectly assume that all metal ions will produce a precipitate when reacted with sodium hydroxide.
To correctly identify cations, remember that only certain metal ions form insoluble hydroxides. For example, when testing with sodium hydroxide, use the formula for the reaction: Metal Ion + NaOH → Metal Hydroxide (precipitate). For instance, Fe²⁺ + 2NaOH → Fe(OH)₂ (s) shows a green precipitate, while Na⁺ does not produce any precipitate. Always check the solubility rules for hydroxides.
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