Chemistry 0620 · IGCSE · Identification of ions and gases

Identification of ions and gases — practice question

A blend of two substances, R and S, is warmed gently. The moist red litmus paper changes to blue. Which substances are R and S?

  • AR: a basic oxide; S: ammonium chloride
  • BR: a basic oxide; S: sodium nitrate
  • CR: an acidic oxide; S: ammonium chloride
  • DR: an acidic oxide; S: sodium nitrate

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