Transition metals

Question 1

True transition metal definition

Answer 1

d-block elements forming at least one stable ion with partially filled d-sub shells (not Sc or Zn)

Question 2

Ligand definition

Answer 2

a molecule or ion that donates a pair of electrons to a central metal ion to form a coordinate bond

Question 3

Coordination number

Answer 3

the total number of coordinate bonds formed between the central metal ion and any ligands

Question 4

EDTA 4- use

Answer 4

forms 6 coordinate bonds
detergents&foods as a stabiliser
prevents blood clotting

Question 5

Use of cis-platin

Answer 5

important anti-cancer drug- prevents cell division

Question 6

Cu 2+ solution colour

Answer 6

pale blue

Question 7

Fe 2+ solution colour

Answer 7

pale green

Question 8

Fe 3+ solution colour

Answer 8

pale yellow

Question 9

Mn 2+ solution colour

Answer 9

pale pink

Question 10

Cr 3+ solution colour

Answer 10

Violet

In presence of H2SO4=green

Question 11

Cu 2+ with NaOH

Answer 11

pale blue ppt, Cu(OH)2

Question 12

Fe 2+ with NaOH

Answer 12

green ppt, Fe(OH)2, oxidises to brown in air Fe(OH)3

Question 13

Fe 3+ with NaOH

Answer 13

rusty brown ppt, Fe(OH)3

Question 14

Mn 2+ with NaOH

Answer 14

light brown ppt, Mn(OH)2, darkens in air

Question 15

Cr 3+ with NaOH

Answer 15

grey-green ppt, Cr(OH)3, soluble in excess [Cr(OH)6]3-

Question 16

Transition metals with NH3

Answer 16

hydroxide ppt forms

Question 17

Cu 2+ with excess NH3

Answer 17

royal blue solution, [Cu(NH3)4(H2O)2]2+

Question 18

Cr 3+ with excess NH3

Answer 18

purple solution, [Cr(NH3)6]3+

Question 19

Cu 2+ with conc. HCl

Answer 19

Yellow solution, [CuCl4]2-