Question 1

Which of the following best explains why the same transition metal ion can produce different colors in gemstones such as rubies and emeralds?

Accepted Answer

The color is determined by the type of ligands surrounding the metal ion, which affect the crystal field splitting energy $$\Delta.$$

Question 2

Which electron configuration represents $$\mathrm{Mn$$^{2+}$$}$$?

Accepted Answer

$$[\mathrm{Ar}]\ 3d^5$

Question 3

What is the main reason for the similarity in atomic radii between the second and third rows of transition metals?

Accepted Answer

The lanthanide contraction, which reduces the expected increase in size.

Question 4

Which transition metal ion is most likely to exhibit the greatest number of stable oxidation states?

Accepted Answer

Chromium ($$\mathrm{Cr})$$

Question 5

How many moles of ions are produced when 1 mole of $$[\mathrm{Co(NH_3$)_6}]\mathrm{Cl}_3$$ dissolves in water?

Accepted Answer

4 moles

Question 6

Which ligand is classified as polydentate?

Accepted Answer

EDTA ($$\mathrm{C$$_{10}$$H_{16}N_2O$$_$$8^{4-}$$}$)

Question 7

Which ligand can form linkage isomers?

Accepted Answer

Thiocyanate ($$\mathrm{SCN^-})$$

Question 8

What is the correct name for the compound $$\mathrm{Fe[$$AlCl_6$$]}$$?

Accepted Answer

iron(III) hexachloroaluminate

Question 9

Which of the following structures can exhibit cis–trans isomerism?

Accepted Answer

$$\mathrm{MA_4B_2}$$

Question 10

Which of the following structures can exhibit fac–mer isomerism?

Accepted Answer

$$\mathrm{MA_3B_3}$$

Question 11

Which property distinguishes optical isomers from other types of isomers?

Accepted Answer

They are non-superimposable mirror images and rotate polarized light differently.

Question 12

In crystal field theory, what causes the color of a transition metal complex?

Accepted Answer

The absorption of visible light due to electronic transitions between split $$d$$ orbitals.

Question 13

Calculate the crystal field splitting energy $$\Delta (in kJ/$$mol) for a complex ion that absorbs light at $$490\ \mathrm{nm}. $$Use $$h = 6.626 	imes 10$$^{-34}$$\ \mathrm{J\cdot s}$$, $$c = 3.00 	imes 10^8$\ \mathrm{m/s}$$, and $$N_A = 6.02 	imes 10$$^{23}$$\ \mathrm{$$mol^{-1}$$}.$$

Accepted Answer

$$\Delta = 244\ \mathrm{kJ/mol}$$

Question 14

Which of the following complex ions absorbs light of the shortest wavelength?

Accepted Answer

$$[\mathrm{Cr(CN)_6}]^{3-}$$

Question 15

Which of the following statements about strong-field ligands is correct?

Accepted Answer

Strong-field ligands cause a large crystal field splitting energy $$\Delta.$$

Question 16

How many unpaired electrons would you expect for the complex ion $$[\mathrm{Co(OH)_6}]^{3-}$$, assuming weak-field ligands?

Accepted Answer

4

Question 17

Which of the following is a real-world application of chelating agents such as EDTA?

Accepted Answer

EDTA is used to treat heavy-metal poisoning by binding metal ions.

Question 18

Which biomolecule contains a transition metal and is essential for oxygen transport in the blood?

Accepted Answer

Hemoglobin

Question 19

Which coordination compound is used as an anticancer drug?

Accepted Answer

Cisplatin

Transition Metals and Coordination Compounds: Structure, Properties, and Applications

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