Chemistry · Oct / Nov 2025 · Paper 12 · Question 40
5070Identification of ions and gases
Solid Q reacts with dilute hydrochloric acid, producing a gas that turns limewater milky. Warming solid Q with aqueous sodium hydroxide produces a gas that turns damp red litmus paper blue. What is solid Q?
- Aammonium carbonate
- Bammonium nitrate
- Ccalcium carbonate
- Dcalcium nitrate
As printed in the paper
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Correct answer: A. ammonium carbonate
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