Which of the following statements concern with transition metals ?
compounds containing ions of transition elements are usually coloured
the most common oxidation state is $+3$
they easily form complexes
All of the above
Chloride of which of the following element is coloured
The number of unpaired electrons in ferrous ion is
The aqueous solution of $CuCrO_4$ is green because it contains
Transition metal with low oxidation number will act as
The transition metals have a less tendency to form ions due to