Question 1

Which of the following best describes the main assumption of Crystal Field Theory (CFT) when applied to transition metal complexes?

Accepted Answer

CFT treats ligands as point negative charges and focuses on electrostatic interactions with the metal d orbitals.

Question 2

In an octahedral complex, which d orbitals experience the greatest repulsion from the ligands?

Accepted Answer

dx2-y2 and dz2

Question 3

For a transition metal ion in a vacuum, what is true about the energy of its five d orbitals?

Accepted Answer

The d orbitals are degenerate and have the same energy.

Question 4

Which ligand would produce the largest crystal field splitting energy ($$\Delta_o) in an $$octahedral complex?

Accepted Answer

CN$$^-$$

Question 5

Given the complex [Fe(CN)$$_6$$]$$^{3-}$$, what is the number of unpaired electrons in the iron ion?

Accepted Answer

1

Question 6

Which equation correctly relates the energy of a photon to its wavelength?

Accepted Answer

$$E = hc/\lambda$$

Question 7

A transition metal complex absorbs light at a wavelength of 600 nm. What happens to the value of $$\Delta_o if $$the complex is modified to absorb at 400 nm?

Accepted Answer

$$\Delta_o$$ increases

Question 8

Which of the following best explains why [Ni(en)$$_3$$]$$^{2+} is $$more stable than [Ni(NH$$_3$$)$$_6$$]$$^{2+}$$?

Accepted Answer

Chelating ligands increase the entropy of the system, making the complex more stable.

Question 9

Which of the following complexes would you expect to be colorless?

Accepted Answer

[Ti(H$$_2O$$)$$_6$$]$$^{4+}$$

Question 10

Which of the following statements about the action of cisplatin as an anti-cancer drug is correct?

Accepted Answer

Cisplatin binds to the N7 position of guanine bases in DNA, causing intrastrand crosslinks.

Question 11

Which of the following best describes the difference in magnetic properties between oxyhemoglobin and deoxyhemoglobin?

Accepted Answer

Oxyhemoglobin is diamagnetic and deoxyhemoglobin is paramagnetic.

Question 12

Which of the following is a real-world application of chelation therapy?

Accepted Answer

Treatment of Wilson’s disease (copper overload)

Question 13

Which of the following complex ions would absorb light with the longest wavelength?

Accepted Answer

[CoF$$_6$$]$$^{4-}$$

Question 14

Which of the following best explains why carbon monoxide (CO) is toxic to humans?

Accepted Answer

CO binds more strongly to hemoglobin than O$$_2$$, preventing oxygen transport.

Question 15

Which of the following statements about the spectrochemical series is correct?

Accepted Answer

CN$$^-$$ and CO are strong field ligands and cause large $$\Delta_o.$$

Question 16

A complex absorbs green light. What color will the complex appear to the human eye?

Accepted Answer

Red

Question 17

Which of the following best describes the chelate effect?

Accepted Answer

Chelating ligands form more stable complexes due to increased entropy.

Question 18

Which of the following is the correct electron configuration for Fe$$^{3+}$$?

Accepted Answer

[Ar] 4s$$^0 3d$^5$$

Question 19

Which of the following best explains why [FeF$$_6$$]$$^{3-} is $$high spin and [Fe(CN)$$_6$$]$$^{3-} is $$low spin?

Accepted Answer

F$$^- is a $$weak field ligand and CN$$^- is a $$strong field ligand.

Crystal Field Theory and Transition Metal Complexes: Structure, Colour, and Applications

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