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6. What is the colour change when [Fe(H2O)6] 2+ becomes [Fe(H2O)4(OH)2] ?

  • Brown solution to brown-yellow precipitate
  • Green solution to brown solution
  • Pale green solution to green precipitate
  • Blue solution to pale blue precipitate

7. What colour is the Chromate(VI) ion in solution ( CrO4 2- )?

  • Green
  • Yellow
  • Orange
  • Blue

8. What colour is [Co(Cl)4]2- ?

  • Yellow solution
  • Blue solution
  • Pink solution
  • Green solution

9. What colour is VO2 + ?

  • Blue
  • Purple
  • Yellow
  • Green

10. What colour is [Cu(Cl)4]2- ?

  • Dark blue solution
  • Yellow solution
  • Brown precipitate
  • Dark green solution

11. What colour is [Cr(H2O)6] 3+ ?

  • Brown precipitate
  • Violet or green solution
  • Yellow solution
  • Orange solution

12. What colour is Vanadium(III) ?

  • Purple
  • Green
  • Blue
  • Yellow

13. What colour is [Co(H2O)6]2+ ?

  • Blue precipitate
  • Pale blue solution
  • Pink solution
  • Brown solution

14. What colour is Cr3+?

  • Blue
  • Purple
  • Green
  • Yellow

15. What colour is VO 2+ ?

  • Green
  • Blue
  • Yellow
  • Purple

16. What colour is [Cu(H2O)6]2+ ?

  • Pink solution
  • Blue solution
  • Blue precipitate
  • Yellow solution

17. What colour is [Cu(NH3)4(H2O)2]2+ ?

  • Dark blue solution
  • Light blue precipitate
  • Pale blue solution
  • Pink solution

18. What colour is vanadium in its lowest oxidation state, 2+ ?

  • Yellow
  • Purple
  • Green
  • Blue

19. What colour is [Cr(OH)6]3- ?

  • Green solution
  • Yellow solution
  • Green precipitate
  • Orange solution

20. What colour is Cr2+?

  • Orange solution
  • Green solution
  • Blue solution
  • Violet solution