Which of the following has highest ionic radii
$C{r^{ + 3}}$
$M{n^{ + 3}}$
$F{e^{ + 3}}$
$C{o^{ + 3}}$
Which ion is not coloured
The compound which does not show paramagnetism is :-
Which one of the following compounds is not coloured
Which of the following ions are diamagnetic ?
A blue colouration is not obtained when