Which is not true for transition elements
They are all metals
They show variable valency
They form coloured ions
They do not form co-ordinate compounds
Which of the following ions will exhibit colour in aqueous solutions?
Electrons in a paramagnetic compound are
Amongst $Ti{F_6}^{2 - }\,,\,Co{F_6}^{3 - }\,,\,C{u_2}C{l_2}$ and $NiCl_4^{2-}$ the colourless species are
Assertion : Cuprous ion $(Cu^+)$ has unpaired electrons while cupric ion $(Cu^{2+})$ does not.
Reason : Cuprous ion $(Cu^+)$ is colourless whereas cupric ion $(Cu^{2+})$ is blue in the aqueous solution.
Transition element makes complex compound due to