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6. Some metals form a coloured precipitate with NaOH which is another way we can test for metal ions

  • True
  • False

7. If the colour of the precipitate goes blue, which of these metal ions are present?

  • Iron (III)
  • Calcium
  • Aluminium
  • Copper (II)
  • Iron (II)

8. If the colour of the precipitate goes reddish brown, which of these metal ions are present?

  • Copper (II)
  • Iron (II)
  • Iron (III)
  • Calcium
  • Aluminium

9. The test for nitrates produces ammonia

  • True
  • False

10. Which of these techniques is NOT used to identify elements or compounds?

  • Mass Spectrometry
  • Infrared Spectrometry
  • They all are used
  • Gas-liquid Chromatography
  • Ultra-violet Spectroscopy