Transition Metal Colours

Question 1

Cr2+

Answer 1

Blue solution

Question 2

Cr2O72-

Answer 2

Orange solution

Question 3

CrO42-

Answer 3

Yellow solution

Question 4

Mn2+

Answer 4

Pale pink, almost colourless solution

Question 5

MnO4-

Answer 5

Purple solution

Question 6

MnO2

Answer 6

Brown ppt

Question 7

[Co(NH3)6]2+

Answer 7

Brown solution which goes darker with aerial oxidation

Question 8

Fe2+

Answer 8

Pale green solution

Question 9

Fe3+

Answer 9

Yellow/brown solution

Question 10

[Cr(NH3)6]3+

Answer 10

Violet solution

Question 11

[Cr(OH)3(H20)3]

Answer 11

Green ppt

Question 12

[Co(OH)2(H2O)4]

Answer 12

Blue ppt

Question 13

[Co(H2O)6]2+

Answer 13

Pink solution

Question 14

Cu2+

Answer 14

Blue solution

Question 15

Cu+

Answer 15

Colourless solution

Question 16

Cu2O

Answer 16

Red ppt

Question 17

Zn2+

Answer 17

Colourless solution

Question 18

[CoCl4]2-

Answer 18

Deep blue solution

Question 19

[Cu(NH3)4(H20)2]2+

Answer 19

Dark blue solution

Question 20

[CuCl4]2-

Answer 20

Yellow-green solution

Question 21

V2+

Answer 21

Purple solution

Question 22

V3+

Answer 22

Green solution

Question 23

[VO]2+ (V4+)

Answer 23

Blue solution

Question 24

[VO2]+ (Vanadium 5+)

Answer 24

Yellow

Question 25

You better get vanadium

Answer 25

Yellow blue green violet (5+ 4+ 3+ 2+)

Question 26

Fe(OH)2(H2O)4

Answer 26

Green ppt

Question 27

Fe(OH)3(H2O)3

Answer 27

Orange ppt

Question 28

[Fe(OH)6]3-

Answer 28

Brown gelatinous ppt