MCQ
Transition metal compounds are usually colored. This is due to the electronic transition:
- AFrom $p-$orbital to $s-$orbital.
- BFrom $d-$orbital to $s-$orbital.
- CFrom $d-$orbital to $p-$orbital.
- ✓Within the $d-$orbitals.
✓
Answer
Correct option: D.
Within the $d-$orbitals.
Colour in transition series metal compounds arises due to two types of transitions. they are:
$(a)$ Charge transfer transitions $[$Ligand$-$to$-$metal charge transfer $(\text{LMCT}),$ Metal$-$to$-$ligand charge transfer$]$
$(b) d−d$ transition
In transition metal complexes, all the $d−$ orbitals do not possess same energy. So, electrons can jump from a lower energy $d−$ orbital to a higher energy $d−$ orbital, by absorbing energy. When it returns to the ground state, excess energy is released, and a corresponding wavelength is found in the visible region.
$(a)$ Charge transfer transitions $[$Ligand$-$to$-$metal charge transfer $(\text{LMCT}),$ Metal$-$to$-$ligand charge transfer$]$
$(b) d−d$ transition
In transition metal complexes, all the $d−$ orbitals do not possess same energy. So, electrons can jump from a lower energy $d−$ orbital to a higher energy $d−$ orbital, by absorbing energy. When it returns to the ground state, excess energy is released, and a corresponding wavelength is found in the visible region.
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