Chemistry 0620 · IGCSE · Identification of ions and gases

Identification of ions and gases — practice question

A chemical reaction is performed on substance X. A gas is released that changes red litmus paper to blue. What is this reaction?

  • Athe reaction of an acid with a metal carbonate
  • Bthe reaction of an acid with an ammonium salt
  • Cthe reaction of an alkali with a metal carbonate
  • Dthe reaction of an alkali with an ammonium salt

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