Chemistry 5070 · O Level · Identification of ions and gases

Identification of ions and gases — practice question

Some test results for polluted river water are displayed. Which metal ion has to be present in the water?

  • A$\text{Al}^{3+}$
  • B$\text{Ca}^{2+}$
  • C$\text{Fe}^{2+}$
  • D$\text{Zn}^{2+}$

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