Q: A coordination compound absorbs light at $$550\ \mathrm{nm}. $$What is the energy of this light in $$\mathrm{kJ/mol}$$? (Use $$h = 6.626 \times 10$$^{-34}$$\ \mathrm{J\cdot s}$$, $$c = 3.00 \times 10^8$\ \mathrm{m/s}$$, $$N_A = 6.022 \times 10$$^{23}$$\ \mathrm{mol}^{-1})$$

$$2.17 \times 10^2$\ \mathrm{kJ/mol}$$

Question 1

What is the correct IUPAC name for the complex ion $$[Cr(NH_3$)_2(C_2O_4)_2]^-$$?

Accepted Answer

Diamminedioxalatochromate(III)

Question 2

Which of the following correctly describes the geometry and coordination number of $$[$$PtCl_4$$]^{2-}$$?

Accepted Answer

Square planar, coordination number 4

Question 3

Given the complex $$[Fe(CN)_6]^{4-}$$, what is the oxidation state of iron?

Accepted Answer

$$+2$$

Question 4

Which of the following ligands is considered a strong field ligand according to Crystal Field Theory?

Accepted Answer

$$CN^-$$

Question 5

A solution of $$[Ti(H_2O)_6]^{3+}$$ appears purple. Which color of light does it absorb most strongly?

Accepted Answer

Green-yellow (around 500-570 nm)

Question 6

What is the correct formula for tetraamminedichlorocopper(II) chloride?

Accepted Answer

$$[Cu(NH_3$)_4Cl_2]Cl$$

Question 7

Which d orbitals experience the greatest increase in energy in an octahedral crystal field?

Accepted Answer

$$d_{z^2$}$$ and $$d_{x^2$-y^2$$}$

Question 8

A coordination compound absorbs light at $$550\ \mathrm{nm}. $$What is the energy of this light in $$\mathrm{kJ/mol}$$? (Use $$h = 6.626 	imes 10$$^{-34}$$\ \mathrm{J\cdot s}$$, $$c = 3.00 	imes 10^8$\ \mathrm{m/s}$$, $$N_A = 6.022 	imes 10$$^{23}$$\ \mathrm{mol}^{-1})$$

Accepted Answer

$$2.17 	imes 10^2$\ \mathrm{kJ/mol}$$

Question 9

Which of the following is the correct name for $$K_3$$[Fe(CN)_6]$$?

Accepted Answer

Potassium hexacyanoferrate(III)

Question 10

Which of the following best explains why $$[$$CoF_6$$]^{3-} is $$high-spin while $$[Co(CN)_6]^{3-} is $$low-spin?

Accepted Answer

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

Question 11

What is the coordination number and geometry of $$[Ag(NH_3$)_2]^+$$?

Accepted Answer

2, linear

Question 12

Which of the following is the correct formula for tetraquadochlorochromium(III) chloride?

Accepted Answer

$$[Cr(H_2O)_4Cl_2]Cl$$

Question 13

Which of the following statements about the color of coordination compounds is correct?

Accepted Answer

The observed color is complementary to the color of light absorbed

Question 14

What is the correct name for $$[Cu(NH_3$)_4]Cl_2$?

Accepted Answer

Tetraamminecopper(II) chloride

Question 15

Which of the following best describes the bonding in coordination compounds according to Crystal Field Theory?

Accepted Answer

Primarily electrostatic interaction between ligands and metal ion

Question 16

Which of the following is the correct order of steps for naming a coordination compound?

Accepted Answer

Cation first, ligands in alphabetical order, metal with oxidation state

Question 17

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

Accepted Answer

$$[Fe(H_2O)_6]^{2+}$$

Question 18

If a complex ion absorbs light at $$680\ \mathrm{nm}$$, what color will the solution appear?

Accepted Answer

Green

Question 19

Which of the following is the correct name for $$[$$PtCl_4$$]^{2-}$$?

Accepted Answer

Tetrachloroplatinate(II)

Question 20

Which of the following best explains why $$[Ni(CN)_4]^{2-} is $$square planar while $$[$$NiCl_4$$]^{2-} is $$tetrahedral?

Accepted Answer

$$CN^- is a $$strong field ligand, causing $$d^8 Ni(II) to $$adopt square planar geometry

Coordination Compounds: Structure, Nomenclature, and Crystal Field Theory

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