Chemistry 0620 · IGCSE · Identification of ions and gases

Identification of ions and gases — practice question

Two tests are carried out on an NPK fertiliser. test 1 flame test test 2 warm with aqueous sodium hydroxide and aluminium foil What observations are made?

  • Atest 1: green flame; test 2: gas evolved which turns red litmus blue
  • Btest 1: green flame; test 2: gas evolved which turns blue litmus red
  • Ctest 1: lilac flame; test 2: gas evolved which turns red litmus blue
  • Dtest 1: lilac flame; test 2: gas evolved which turns blue litmus red

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