Transition metals colours

Question 1

Cu2+ in aqueous solution

Answer 1

light blue sol

Question 2

Co2+ in aqueous solution

Answer 2

pale pink sol

Question 3

Fe2+ in aqueous solution

Answer 3

pale green sol

Question 4

Fe3+ in aqueous solution

Answer 4

yellow sol

Question 5

Cr3+ in aqueous solution

Answer 5

dark green sol

Question 6

formation of 2+ ions in aqueous solution

Answer 6

[M(H2O)6] 2+

Question 7

formation of 3+ ions in aqueous solution

Answer 7

[M(H2O)6] 3+

Question 8

Cu2+ in limited OH

Answer 8

blue ppt

Question 9

Co2+ in limited OH

Answer 9

blue ppt

Question 10

Fe2+ in limited OH

Answer 10

green ppt

Question 11

Fe3+ in limited OH

Answer 11

brown ppt

Question 12

Cr3+ in limited OH

Answer 12

green ppt

Question 13

formation of 2+ ions in limited OH

Answer 13

[M(OH)2(H2O)4]2+

Question 14

formation of 3+ ions in limited OH

Answer 14

[M(OH)3(H2O)3]

Question 15

Cu2+ in excess NH3

Answer 15

royal/dark blue sol

Question 16

Co2+ in excess NH3

Answer 16

red/brown sol

Question 17

Fe2+ and Fe3+ in excess NH3

Answer 17

X

Question 18

Cr3+ in excess NH3

Answer 18

purple sol

Question 19

Cu2+ in excess NH3 displayed incomplete ligand substitution.

what is the formation of this complex ion

Answer 19

[Cu(Nh3)4(H2O)2]2+

Question 20

Co2+ in excess NH3
what is the formation of the complex ion

Answer 20

[Co(NH3)6]2+

Question 21

Cr3+ in excess NH3
what is the formation of the complex ion

Answer 21

[Cr(NH3)6]3+

Question 22

Cu2+, Co2+, Fe2+, Fe3+ all in excess OH (acid-base)

Answer 22

X

Question 23

Cr3+ in excess OH (acid-base) colour

Answer 23

green sol

Question 24

Cr3+ in excess OH (acid-base) colour

ALKALI (OH-) equation

Answer 24

Cr(H2O)3(OH)3 (s) + 3OH- (aq) —> [Cr(OH)6]3- (aq) + 3H2O (l)

Question 25

Cr3+ in excess OH (acid-base) colour ACID (H+) equation

Answer 25

Cr(H2O)3(OH)3 (s) + 3H+ (aq) ---> [Cr(H2O)6]3+ (aq)

Question 26

Cu2+ and Fe3+ redox

Answer 26

X

Question 27

Co2+ redox colour

Answer 27

D. brown sol

Question 28

Fe2+ redox colour

Answer 28

orange ppt

Question 29

Cr3+ redox colour

Answer 29

yellow sol (wH2O2) CrO42-

Question 30

Co2+ and Fe2+ redox complex ion formula

Answer 30

M(OH)3(H2O)3

Question 31

Cu2+ in Cl- ions colour

Answer 31

green sol

Question 32

Co2+ in Cl- ions colour

Answer 32

blue sol

Question 33

Cu2+ and Co2+ in Cl- ion formation and shape

Answer 33

[MCl4]2- tetrahedral