Question:
In which one of the following, d-d transition involves absorption in the ultraviolet region
In which one of the following, d-d transition involves absorption in the ultraviolet region
Updated On: June 02, 2025
- $[Cu(H_2O)_4]^{2+}$
- $[Ti(H_2O)_6]^{3+}$
- $[Co(NH_3)_6]^{3+}$
- $[Co(CN)_6]^{3-}$
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The Correct Option is D
Approach Solution - 1
The wavelength of light absorbed by $\left[ Co ( CN )_{6}\right]^{3-}$ is $310\, nm$ which corresponds to the UV region and not in the visible region.
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Approach Solution -2
The correct response is (D)
Since \([Co(CN)_6]^{3-}\)absorbs light at a wavelength of around 300 nm, which falls in the UV rather than the visible spectrum. This is due to \(CN^-\) potent ligand properties.
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Concepts Used:
Properties of D Block Elements
- Multiple oxidation states- The oxidation states of d block elements show very few energy gaps; therefore, they exhibit many oxidation states. Also, the energy difference between s and d orbital is very less. Therefore both the electrons are involved in ionic and covalent bond formation, which ultimately leads to multiple oxidation states.
- Formation of complex compounds- Ligands show a binding behavior and can form so many stable complexes with the help of transition metals. This property is mainly due to:
- Availability of vacant d orbitals.
- Comparatively small sizes of metals.
- Hardness- Transition elements are tough and have high densities because of the presence of unpaired electrons.
- Melting and boiling points- Melting and boiling points of transition are very high because of the presence of unpaired electrons and partially filled d orbitals. They form strong bonds and have high melting and boiling points.
- Atomic radii- The atomic and ionic radius of the transition elements decreases as we move from Group 3 to group 6. However, it remains the same between group 7 and group 10, and from group 11 to group 12 increases.
- Ionization enthalpy- The ionization enthalpies of the transition elements are generally on the greater side as compared to the S block elements