CAIE IGCSE Chemistry 12.5.1 Anion Tests Questions

Work through real CAIE IGCSE Chemistry questions to identify anions from reagents, precipitate colours, gases and other observations.

Exam points

describe the carbonate test with dilute acid followed by carbon-dioxide confirmation using limewater
describe acidified silver-nitrate tests for chloride, bromide and iodide ions and identify precipitate colours
describe the nitrate test using aluminium foil and aqueous sodium hydroxide, warming to produce ammonia
describe the sulfate and sulfite tests using acidified barium nitrate or acidified potassium manganate(VII) observations

[Maximum number: 1]

When acid is added to salt X, a gas is produced which turns limewater milky.
When sodium hydroxide is added to salt X, a gas is produced which turns litmus paper blue.
What is X ?

$\mathrm{CaCO}_{3}$

$\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3}$

$\mathrm{NH}_{4} \mathrm{NO}_{3}$

$\mathrm{ZnCO}_{3}$

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CAIE IGCSE Chemistry 12.5.1 Anion Tests Questions question 1