Transition metals colours and equations

Question 1

What colour does Sc3+ go in solution

Answer 1

no colour not transition

Question 2

What colour does V2+ go in solution

Answer 2

violet

Question 3

What colour does V3+ go in solution

Answer 3

Green

Question 4

What colour does VO2+ go in solution (v4+)

Answer 4

Blue

Question 5

What colour does VO2, + go in solution (v5+)

Answer 5

Yellow

Question 6

What colour does Cr3+ go in solution

Answer 6

Green, unless surrounded by 6h2O then violet

Question 7

What colour does Cr2O7 2- go in solution

Answer 7

orange

Question 8

What colour does Mn2+ go in solution

Answer 8

pale pink

Question 9

What colour does MnO4- go in solution

Answer 9

purple

Question 10

What colour does Fe2+ go in solution

Answer 10

Pale green

Question 11

What colour does Fe3+ go in solution

Answer 11

Yellow

Question 12

What colour does Co2+ go in solution

Answer 12

Pink

Question 13

What colour does Ni2+ go in solution

Answer 13

Green

Question 14

What colour does Cu2+ go in solution

Answer 14

Blue

Question 15

What colour does Zn2+ go in solution

Answer 15

no colour as not transition metal

Question 16

Write a half equation for the reduction of MnO4- to Mn2+

Answer 16

MnO4- + 8H+ + 5e- —> Mn2+ +4H2O

Question 17

Write a half equation for the reduction of Cr2O72- to Cr3+

Answer 17

Cr2O7 2- +14H+ + 6e- —> 2Cr3+ + 7H2O

Question 18

need to do substitution and catalyst equations

Answer 18

do them

Question 19

ligand sub of hexaaquacobalt 2 with ammonia

Answer 19

[Co(H2O)6]2+(aq) + 6NH3(aq) –> [Co(Nh3)6]2+(aq) + 6H2O (l)
pink - straw
octahedral

Question 20

partial ligand sub of hexa aqua copper 2 with ammonia

Answer 20

[Cu(H2O)6]2+(aq) + 4NH3(aq) –> [Cu(NH3)4(H2O)2]2+(aq) + 4H2O(l)
Blue - dark blue
octahedral

Question 21

ligand sub of hexa aqua cobalt 2 with Cl-

Answer 21

[Co(H2O)6]2+ +4Cl-(aq) –> [CoCl4]2-(aq) +6H2O(l)
Pink octahedral - blue tetrahedral

Question 22

ligand sub of hexa aqua copper 2 with Cl-

Answer 22

[Cu(H2O)6]2+(aq) + 4Cl-(aq) –> [CuCl4]2-(aq) +6H2O(l)
blue octahedral - yellow tehtrahedral

Question 23

ligand sub of hexa aqua iron 2 with Cl-

Answer 23

[Fe(h2O)6]3+ +Cl4- –> [FeCl4]-(aq) + 6H2O(l)
yellow octahedral –> yellow tetrahedral

Question 24

equation of haber process

Answer 24

N2(g) + 3H2(g) –><– 2Nh3(g) iron catalyst

Question 25

equation of contact process

Answer 25

1. SO2 + V2O5 –> SO3 + V2O4 X2
2. 2V2O4 +O2 –> 2V2O5
3. 2SO2 + 2V2O5 –> 2SO3 + 2V2O4

overall = 2SO2 + O2 –> 2SO3