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6. When MORE OH- is added to a Zinc with OH- solution is added, what is observed?

  • White ppt dissolves to form a colourless solution
  • Colourless ppt dissolves to form a white solution
  • No change from a white ppt
  • No change from a colourless ppt

7. Which two transition metal (ions) produce white precipitates in reactions both with OH- and NH3? (not in excess)

  • Manganate and Zinc
  • Nickel and Zinc
  • Mangante and Copper (II)
  • Zinc and Iron (III)

8. Reaction of Copper (II) with excess Ammonia produces a...

  • Blue precipitate
  • Green precipitate
  • Deep blue solution
  • Green solution

9. What is observed when Iron (II) reacts with sodium hydroxide or NH3?

  • Green precipitate
  • Green precipitate which redissolves to form a green solution
  • Brown precipitate
  • Blue precipitate

10. What colour is the Cr3+ ion in water?

  • Blue precipitate
  • Violet solution
  • Blue solution
  • Violet precipitate

11. Reaction of Iron (III) with ammonia produces a...

  • Blue solution
  • Yellow precipitate
  • Brown precipitate
  • Green precipiate

12. Only Zinc and Chronium react to produce a different colour with excess OH- added.

  • True
  • False