colours (of TM)

Question 1

what colour are Cu2+ ions

Answer 1

blue

Question 2

what colour are Fe2+ ions

Answer 2

pale green

Question 3

what colour are Fe3+ ions

Answer 3

pale yellow

Question 4

what colour are Mn2+ ion

Answer 4

pale pink

Question 5

what colour are Cr3+ ions

Answer 5

violet

Question 6

what colour are Cu2+ in excess NaOH

Answer 6

blue ppte

Question 7

what colour are Fe2+ in excess NaOH

Answer 7

green ppte, when left in air a brown layer forms as Fe2+ is oxidised to Fe3+

Question 8

what colour are Fe3+ in excess NaOH

Answer 8

orange brown ppte

Question 9

what colour are Mn2+ in excess NaOH

Answer 9

light brown ppt, when left in air a dark brown ppt forms.

Question 10

what colour are Cr3+ in NaOH

Answer 10

grey green ppte -> soluble in excess forming a dark green solution.

Question 11

what colour are Cr3+ in excess ammonia

Answer 11

purple solution

Question 12

what colour are Cu2+ in excess ammonia

Answer 12

dark blue solution

Question 13

what colour is Cr2O7 2-

Answer 13

orange

Question 14

what colour is CoCl4 2-

Answer 14

blue

Question 15

what colour is MnO4 -

Answer 15

purple

Question 16

what colour is CuCl4 2-

Answer 16

yellow