Properties Of Transition Metals

Question 1

Ti³⁺

Answer 1

Purple

Question 2

Ti²⁺

Answer 2

Violet

Question 3

VO₂ ⁺

Answer 3

Yellow

Question 4

VO²⁺

Answer 4

Blue

Question 5

V³⁺

Answer 5

Green

Question 6

V²⁺

Answer 6

Violet

Question 7

Cr₂O₇²⁻

Answer 7

Orange

Question 8

Cr³⁺

Answer 8

Violet (Green in solutions)

Question 9

MnO₄⁻

Answer 9

Purple

Question 10

MnO₄²⁻

Answer 10

Green

Question 11

Mn²⁺

Answer 11

Pale Pink

Question 12

Fe³⁺

Answer 12

Yellow

Question 13

Fe²⁺

Answer 13

Pale Green

Question 14

Co³⁺

Answer 14

Green

Question 15

Co²⁺

Answer 15

Pink

Question 16

Ni²⁺

Answer 16

Green

Question 17

Cu²⁺

Answer 17

Pale Blue

Question 18

[Cu(H₂O)₆]²⁺(aq) + 2OH⁻(aq) → Cu(OH)₂(H₂O)₄ + 2H₂O(l)

Answer 18

Pale blue solution to a blue precipitate

Question 19

Cu(OH)₂(H₂O)₄ + Excess NH₃ → [Cu(NH₃)₄(H₂O)₂]²⁺(aq)

Answer 19

Blue precipitate to deep blue solution

Question 20

[Cu(H₂O)₆]²⁺(aq) + 2NH₃(aq) → Cu(OH)₂(H₂O)₄ + 2NH₄⁺(aq)

Answer 20

Pale blue solution to blue precipitate

Question 21

[Fe(H₂O)₆]²⁺(aq) + 2OH⁻(aq) → Fe(OH)₂(H₂O)₄ + 2H₂O(l)

Answer 21

Pale green solution to green precipitate that darkens on standing

Question 22

[Fe(H₂O)₆]²⁺(aq) + 2NH₃(aq) → Fe(OH)₂(H₂O)₄ + 2NH₄⁺(aq)

Answer 22

Pale green solution to green precipitate that darkens on standing

Question 23

[Fe(H₂O)₆]³⁺(aq) + 3OH⁻(aq) → Fe(OH)₃(H₂O)₃ + 3H₂O(l)

Answer 23

Yellow solution to orange precipitate which darkens on standing

Question 24

[Fe(H₂O)₆]³⁺(aq) + 3NH₃(aq) → Fe(OH)₃(H₂O)₃ + 3NH₄⁺(aq)

Answer 24

Yellow solution to orange precipitate which darkens on standing

Question 25

[Mn(H₂O)₆]²⁺(aq) + 2OH⁻(aq) → [Mn(OH)₂(H₂O)₄](s) + 2H₂O(l)

Answer 25

Pale pink solution to pink/buff precipitate which darkens on standing

Question 26

[Mn(H₂O)₆]²⁺(aq) + 2NH₃(aq) → [Mn(OH)₂(H₂O)₄](s) + 2NH₄⁺(aq)

Answer 26

Pale pink solution to pink/buff precipitate which darkens on standing

Question 27

[Cr(H₂O)₆]³⁺(aq) + 3OH⁻(aq) → [Cr(OH)₃(H₂O)₃](s) + 3H₂O(l)

Answer 27

Green solution to grey-green precipitate

Question 28

[Cr(H₂O)₆]³⁺(aq) + 3NH₃(aq) → [Cr(OH)₃(H₂O)₃](s) + 3NH₄⁺(aq)

Answer 28

Green solution to grey-green precipitate

Question 29

[Cr(OH)₃(H₂O)₃](s) + Excess NaOH → Cr(OH)₆³⁻(aq)

Answer 29

Grey-green precipitate to dark green solution

Question 30

[Cr(OH)₃(H₂O)₃](s) + Excess NH₃ → [Cr(NH₃)₆]³⁺(aq)

Answer 30

Grey-green precipitate to purple solution