Transition metals colours

Question 1

[Cu(H2O)6]2+.

Answer 1

Blue

Name: hexaaquacopper (II)

Question 2

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

Answer 2

Deep blue

Name: tetraamminediaquacopper (II)

Question 3

[CuCl4]2-

Answer 3

Yellow-green

Name: tetrachlorocuprate (II)

Question 4

[Cu(H20)4(OH)2]

Answer 4

Pale blue ppt.

Name: tetraaquadihydroxocopper (II)

Question 5

CuCO3

Answer 5

Green-blue ppt

Name: copper (II) carbonate

Question 6

[Cr(H2O)6]3+

Answer 6

Red-Violet (ruby)

Name: hexaaquachromium (III)

Question 7

[Cr(NH3)6]3+

Answer 7

Purple

Name: hexaamminechromium (III)

Question 8

[Cr(H2O)3(OH)3]

Answer 8

Green ppt

Name: triaquatrihydroxochromium (III)

Question 9

[Cr(OH)6]3-

Answer 9

Green

Name: hexahydroxochromate (III)

Question 10

[Cr(H20)6]2+

Answer 10

Blue

Name: hexaaquachromium (II)

Question 11

[CrO4]2-

Answer 11

Yellow

Name: Chromate (IV)

Question 12

[Cr2O7]2-

Answer 12

Orange

Name: Dichromate (VI)

Question 13

[Co(H2O)6]2+

Answer 13

Pink

Name: hexaaquacobalt (II)

Question 14

[Co(NH3)6]2+

Answer 14

Straw coloured (may darken when Co2+ is oxidised to Co3+ by air)
Name: hexaamminecobalt (II)

Question 15

[Co(NH3)6]3+

Answer 15

Yellow (may appear dark brown)

Name: hexaamminecobolt (III)

Question 16

[CoCl4]2-

Answer 16

Blue

Name: tetrachlorocobaltate (II)

Question 17

[Co(H2O)4(OH)2]

Answer 17

Green-blue ppt

Name: tetraaquadihyrdoxocobalt (II)

Question 18

CoCO3

Answer 18

Pink ppt

Name: Cobalt (II) carbonate

Question 19

[Fe(H2O)6]2+

Answer 19

Green

Name: hexaaquairon (II)

Question 20

[Fe(H2O)4(OH)2]

Answer 20

Green ppt

Name: tetraaquadihydroxoiron (II)

Question 21

FeCO3

Answer 21

Green ppt

Name: Iron (II) carbonate

Question 22

[Fe(H2O)6]3+

Answer 22

Very pale violet

Name: hexaaquairon (III)

Question 23

[Fe(H2O)3(OH)3]

Answer 23

Brown ppt

Name: triaquatrihydroxoiron (III)

Question 24

[Al(H2O)6]3+

Answer 24

Colourless

Name: hexaaquaaluminium (III)

Question 25

[Al(H2O)3(OH)3]

Answer 25

White ppt

Name: triaquatrihydroxoaluminium (III)

Question 26

[Al(OH)4]-

Answer 26

Colourless

Name: tetrahydroxoaluminate (III)

Question 27

[Mn(H2O)6]2+

Answer 27

Very pale pink

Name: hexaaquamanganese (II)

Question 28

[MnO4]-

Answer 28

Purple

Name: Manganate (VII)

Question 29

[Ag(NH3)2]+

Answer 29

Colourless

Name: diamminesilver (I)

Question 30

[Pt(NH3)2Cl2]

Answer 30

Colourless

Name: diamminedichloroplatinium (II)