Chemistry · May / June 2024 · Paper 11 · Question 40
5070Identification of ions and gases
The table shows the results of a series of tests with two substances, X and Y. | test | result with X | result with Y | |---|---|---| | dilute nitric acid added | no reaction | no reaction | | then aqueous silver nitrate added | white precipitate | no precipitate | | aqueous sodium hydroxide added | white precipitate, insoluble in excess | no precipitate | | then aluminium foil added; warmed gently | no gas produced | ammonia produced | | flame test | orange-red flame | yellow flame | Which row shows the identities of the ions present in X and Y?
- ACa2+ and Br– ; Na+ and NO3–
- BCa2+ and Cl– ; Na+ and I–
- CCa2+ and Cl– ; Li+ and NO3–
- DCa2+ and Cl– ; Na+ and NO3–
As printed in the paper
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Correct answer: D. Ca2+ and Cl– ; Na+ and NO3–
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