Chemistry 0620 · IGCSE · Identification of ions and gases

Identification of ions and gases — practice question

Solid S turns from white to blue when water is added. What is the identity of S?

  • Aanhydrous cobalt(II) chloride
  • Banhydrous copper(II) sulfate
  • Chydrated cobalt(II) chloride
  • Dhydrated copper(II) sulfate

Worked solution & mark scheme

This 1-mark question has a full step-by-step worked solution and mark scheme.

  • Full mark scheme, point by point
  • Step-by-step worked solution
  • Write your answer & get it marked instantly by AI