Transition Metals

Question 0

What is the 
•shape
•formula
•colour
of the Hexaaqua copper (II) ion?

Answer 0

• Octahedral
• [Cu(H2O)6] 2+
• Blue

Question 1

Why do transition metals show a range of oxidation states?

Answer 1

Because the 3d and 4s energy levels are very close

Question 2

What is the 
•Name
•Shape 
•Colour 
of the [Cu(NH3)4(H2O)2] 2+ ion?

Answer 2

• Tetraaminediaqua copper (II) ion
• Octahedral
• Deep Royal Blue

Question 3

What compound is formed when a small amount of dilute ammonia is added to Cu 2+?

Answer 3

Cu(OH)2 ppt

Question 4

What is the 
•shape
•formula
•colour
of the Terachlorocuprate (II) ion?

Answer 4

• Tetrahedral
• [CuCl4]2-
• Yellow

Question 5

What colour is Fe2+ aqueous?

Answer 5

Pale Green

Question 6

What colour is Fe3+ aqueous?

Answer 6

Yellow

Question 7

What colour is Cr3+ aqueous?

Answer 7

Green

Question 8

What colour is Cu2+ aqueous?

Answer 8

Blue

Question 9

What colour is Fe2+ with NaOH?

Answer 9

Dirty green and red oxidised layer

Question 10

What colour is Fe3+ with NaOH?

Answer 10

Rust coloured

Question 11

What colour is Cr3+ with small amount of NaOH?

Answer 11

Grey-Green

Question 12

What colour is Cr3+ with NaOH in excess?

What is the formula?

Answer 12

Dark green solution

[Cr(OH)6] 3-

Question 13

What is the general equation for the precipitation of TM ions with NaOH?

Answer 13

M2+/M3+ + 2OH-/3OH- = M(OH)2/

M(OH)3