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Question 1

what is the electron configuration of scandium

Answer 1

1s²2s²2p⁶3s²3p⁶3d¹4s²

Question 2

what is the electron configuration of titanium

Answer 2

1s²2s²2p⁶3s²3p⁶3d²4s²

Question 3

what is the electron configuration of vanadium

Answer 3

1s²2s²2p⁶3s²3p⁶3d³4s²

Question 4

what is the electron configuration of chromium

Answer 4

1s²2s²2p⁶3s²3p⁶3d⁵4s¹

Question 5

what is the electron configuration of manganese

Answer 5

1s²2s²2p⁶3s²3p⁶3d⁵4s²

Question 6

what is the electron configuration of iron

Answer 6

1s²2s²2p⁶3s²3p⁶3d⁶4s²

Question 7

what is the electron configuration of cobalt

Answer 7

1s²2s²2p⁶3s²3p⁶3d⁷4s²

Question 8

what is the electron configuration of nickel

Answer 8

1s²2s²2p⁶3s²3p⁶3d⁸4s²

Question 9

what is the electron configuration of copper

Answer 9

1s²2s²2p⁶3s²3p⁶3d¹⁰4s¹

Question 10

what is the electron configuration of zinc

Answer 10

1s²2s²2p⁶3s²3p⁶3d¹⁰4s²

Question 11

bidentate ligand

Answer 11

Donates 2 lone pairs forms two co-ordinate bonds

Question 12

sterioisomerism

Answer 12

same structural formula but a different arrangement of the atoms in space

Question 13

what are the 2 types of stereoisomerism that complex ions can show?

Answer 13

• cis- trans isomerism

- optical isomerism

Question 14

precipitation reaction

Answer 14

occurs when 2 aqueous solutions containing ions react together to form an insoluble solid, called a precipitate

Question 15

monodentate ligand

Answer 15

donates 1 lone pair forming a co-ordinate bond

Question 16

bidentate ligand

Answer 16

Donates 2 lone pairs forming two co-ordinate bonds

Question 17

[Cu(H₂O)₆]²⁺to [Cu(NH₃)₄(H₂O)2]²⁺

Answer 17

• pale blue solution change to dark blue solution
• when excess of aqueous ammonia
• intermediate is blue of Cu(OH)₂

Question 18

[Cu(H₂O)₆]²⁺ to [CuCl₄]²–

Answer 18

• pale blue solution changes to a yellow solution
• when excess conc. HCl is added
• intermediate green solution forms

Question 19

[Cr(H₂O)₆]³⁺ to [Cr(NH₃)₆]³⁺

Answer 19

• violet solution changes to a purple solution
• excess aqueous ammonia
• intermediate is green-grey of Cr(OH)₃

Question 20

what should you always do when carrying out qualitative analysis tests?

Answer 20

• add reagent drop-wise

- so that all observations are observed

Question 21

which complex ions show cis- trans isomerism

Answer 21

4- coordinate and 6-coordinate complex ions containing 2 different monodentate ligands

Question 22

which complex ions show both cis- trans and optical isomerism

Answer 22

6- coordinate complex ions containing monodentate and bidentate ligands

Question 23

what is the bond angle between identical ligands in cis-isomer of square planar complexes

Answer 23

90

Question 24

what is the bond angle between identical ligands in trans- isomer of square planar complexes

Answer 24

180

Question 25

how can cis- trans isomers exist in octahedral complexes

Answer 25

four of one type of ligand and 2 of another type of ligand

Question 26

how can optical isomers exist in octahedral complexes

Answer 26

containing 2 or more bidentate ligands

Question 27

what are optical isomers also known as?

Answer 27

enantiomer

Question 28

what is a feature of optical isomers?

Answer 28

non- superimposable mirror images of each other

Question 29

disproportionation of Cu²⁺ions

Answer 29

- Cu₂O and hot dilute H₂SO₄ - Cu is brown solid - CuSO₄ is blue solution

Question 30

[Cu(H₂O)₆]²⁺ to Cu(OH)₂

Answer 30

- pale blue solution to pale blue precipitate | - add NaOH (aq)