Why transition elements form a coloured compounds?
Most of the compounds of transition elements are coloured. This can be explained by $d-d$ transition.
In the presence of combining molecules or anions called ligands, the $d$-orbital loses its degeneracy and splits in two sets of orbitals normally i.e., $\mathrm{e}\left(d x^{2}-y^{2}, d z^{2}\right)$ and $\mathrm{t}_{2 g}(d x y, d y z, d x z)$ depending uponthe geometry of the complex.
These sets of orbitals have different energies after splitting and when an electron from low energy $d$-orbital is excited to higher energy $d$-orbital, the energy of excitation corresponds to the frequency of light absorbed.
Transition element makes complex compound due to
In which of these processes platinum is used as a catalyst
$Zn$ and $Cd$ metals do not show variable valency because
A copper salt is isomorphic with $ZnS{O_4}$, the salt will be
Which one of the following characteristics of the transition metals is associated with their catalytic activity