$Zn$ and $Hg$ belong to the same group, they differ in many of their properties. The property that is shared by both is
They form oxide readily
They react with steam readily
They react with hot concentrated sulphuric acid
They react with hot sodium hydroxide
Transition metals are often paramagnetic owing to
$Cr^{+2}$ has a magnetic moment same as that of
Cuprous ion is colourless, while cupric ion is coloured because
In a transition series, as the atomic number increases, paramagnetism
The $3d$ metal ions form coloured compounds because the energy corresponding to the following lies in the visible range of electromagnetic spectrum