May/June 2026 Paper 21

2026 · 40 questions · 40 parts · 40 marks

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28Water Chemistry Water TreatmentMedium1 mark
Which test results show that a sample of water is pure?
  1. 1
    Its boiling point is 100 C.
  2. 2
    Its freezing point is 0 C.
  3. 3
    It turns anhydrous cobalt(II) chloride from blue to pink.
  4. 4
    It turns anhydrous copper(II) sulfate from white to blue.