The d & f Block Elements — Chemistry STD 12 Science — Question
Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryThe d & f Block Elements2 Marks
Question
Explain giving reason: The transition metals generally form coloured compounds.
✓
Answer
Formation of coloured compounds $($both in solid state as well as in aqueous solution$)$ is another very common characteristics of transition metals. This is due to absorption of some radiation from visible light to cause $d-d$ transition of electrons in transition metal atom. The $d-$orbitals do not have same energy and under the influence of ligands, the $d-$orbitals split into two sets of orbitals having different energies; transition of electrons can take place from one set of d orbitals to another set within the same sub shell. Such transitions are called $d-d$ transitions. The energy difference for these $d-d$ transitions fall in the visible region. When white light is incident on compounds of transition metals, they absorb a particular frequency and rernaining colours are emitted imparting a characteristic colour to the complex. $Zn^{2+}$ and $Ti^{4+}$ salts are white because they do not absorb any radiation in visible region.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.