* not completed

. The crystal field theory is defective because:

It treats ligands as point charges or dipoles and does not take into account the overlap of ligand and metal atom orbitals. correct incorrect

It takes into account the overlap of ligand and metal atom orbitals and does not treat ligands as point charges or dipoles. correct incorrect

It does not treat ligands as point charges or dipoles and does not take into account the overlap of ligand and metal atom orbitals. correct incorrect

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. Which statement is correct about the species CN^–, Cl^–, and CO?

The cyanide ion is a weak field ligand, the chloride is a strong field ligand, and CO is a weak field ligand. correct incorrect

The cyanide ion is a strong field ligand, the chloride is a strong field ligand, and CO is a weak field ligand. correct incorrect

The cyanide ion is a strong field ligand, the chloride is a weak field ligand, and CO is a strong field ligand. correct incorrect

* not completed

. The ligand field strength depends not only on the ligands but also on the central metal ion. Thus the relative magnitudes of Δ₀ for Mn²⁺, Ir³⁺, and Pt⁴⁺ are ______, ______, and ______, respectively:

low, high, high correct incorrect

low, low, high correct incorrect

low, low, high correct incorrect

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. Which statement is correct?

In the octahedral complexes the e_g-orbitals lie below the t_2g-ones, at about 60% of Δ_O above the barycenter, while the t_2g-orbitals are at 40% of Δ_O below the barycenter. In tetrahedral complexes the e-orbitals lie above the t₂-ones, at about 60% of Δ_T above the barycenter, while the t₂-orbitals are at 40% of Δ_T above the barycenter. correct incorrect

In octahedral complexes the e_g-orbitals lie above the t_2g-ones, at about 40% of Δ_O above the barycenter, while the t_2g-orbitals are at 60% of Δ_O below the barycenter. In tetrahedral complexes the e-orbitals lie below the t₂-ones, at about 40% of Δ_T above the barycenter, while the t₂-orbitals are at 60% of Δ_T above the barycenter. correct incorrect

In octahedral complexes the e_g-orbitals lie above the t_2g-ones, at about 60% of Δ_O above the barycenter, while the t_2g-orbitals are at 40% of Δ_O below the barycenter. In tetrahedral complexes the e-orbitals lie below the t₂-ones, at about 60% of Δ_T above the barycenter, while the t₂-orbitals are at 40% of Δ_T above the barycenter. correct incorrect

* not completed

. According to the Jahn-Teller theorem:

If the ground electronic configuration in a nonlinear complex is orbitally degenerate and asymmetrically filled, then the complex distorts so as to remove the degeneracy and to achieve lower energy state. correct incorrect

If the ground electronic configuration in a linear complex is orbitally degenerate and symmetrically filled, then the complex distorts so as to remove the degeneracy and to achieve lower energy state. correct incorrect

If the ground electronic configuration in a nonlinear complex is orbitally degenerate and symmetrically filled, then the complex distorts so as to remove the degeneracy and to achieve lower energy state. correct incorrect

* not completed

. According to the ligand field theory:

The building-up principle is used together with the MO energy level diagram constructed from linear combinations of ligand orbitals. correct incorrect

The building-up principle is used together with the MO energy level diagram constructed from metal orbitals and linear combinations of ligand orbitals. correct incorrect

The building-up principle is used together with the MO energy level diagram constructed from metal orbitals. correct incorrect

* not completed

. According to the ligand field theory:

π-donor ligands decrease Δₒ; π-acceptor ligands increase Δₒ. correct incorrect

π-donor ligands increase Δ_o; π-acceptor ligands decrease Δ_o. correct incorrect

Both, π-donor and π-acceptor ligands decrease Δ_o. correct incorrect

* not completed

. If the metal is in high oxidation state and the ligands contain nonbonding electrons, then:

Metal-to-ligand charge-transfer transitions are observed. correct incorrect

Ligand-to-ligand charge-transfer transitions are observed. correct incorrect

Ligand-to-metal charge-transfer transitions are observed. correct incorrect

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. A spectroscopic selection rule distinguishes forbidden from allowed transitions:

A forbidden transition is one for which the calculated transition dipole moment equals zero. correct incorrect

A forbidden transition is one for which the calculated transition dipole moment is greater than zero. correct incorrect

A forbidden transition is one for which the calculated transition dipole moment is less than zero. correct incorrect

* not completed

. Complexes can emit radiation as a result of electronic excitation following absorption of electromagnetic energy.

The general term for this phenomenon is "luminescence." correct incorrect

This phenomenon is called "fluorescence" if the radiative decay occurs from a state of different multiplicity relative to the ground state. correct incorrect

This phenomenon is called "phosphorescence" if the radiative decay occurs from a state of the same multiplicity relative to the ground state. correct incorrect