The UV-visible absorption bands in the spectra of lanthanoid ions are ‘X’ probably because of the excitation of electrons involving ‘Y’. The ‘X’ and ‘Y’, respectively, are [2024]

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Q.
The UV-visible absorption bands in the spectra of lanthanoid ions are ‘X’ probably because of the excitation of electrons involving ‘Y’. The ‘X’ and ‘Y’, respectively, are [2024]

1 broad and $f$ -orbitals

2 narrow and $f$ -orbitals

3 broad and $d$ and $f$ -orbitals

4 narrow and $d$ and $f$ -orbitals.

Ans.
(2)

Many trivalent lanthanoid ions are coloured both in the solid state and in aqueous solutions. Colour of these ions may be attributed to the presence of $f$ -electrons. Neither ${La}^{3 +}$ nor ${Lu}^{3 +}$ ion shows any colour but the rest do so. However, absorption bands are narrow, probably because of the excitation within $f$ -level (orbitals).

Solution

Q.
The UV-visible absorption bands in the spectra of lanthanoid ions are ‘X’ probably because of the excitation of electrons involving ‘Y’. The ‘X’ and ‘Y’, respectively, are [2024]

1 broad and $f$ -orbitals

2 narrow and $f$ -orbitals

3 broad and $d$ and $f$ -orbitals

4 narrow and $d$ and $f$ -orbitals.

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Solution

Q. The UV-visible absorption bands in the spectra of lanthanoid ions are ‘X’ probably because of the excitation of electrons involving ‘Y’. The ‘X’ and ‘Y’, respectively, are [2024]

1 broad and f-orbitals

2 narrow and f-orbitals

3 broad and d and f-orbitals

4 narrow and d and f-orbitals.

Want Us to Email you About Special Offers & Updates?

Q.
The UV-visible absorption bands in the spectra of lanthanoid ions are ‘X’ probably because of the excitation of electrons involving ‘Y’. The ‘X’ and ‘Y’, respectively, are [2024]

1 broad and $f$ -orbitals

2 narrow and $f$ -orbitals

3 broad and $d$ and $f$ -orbitals

4 narrow and $d$ and $f$ -orbitals.