Question 1

Which of the following coordination compounds can exhibit geometric (cis-trans) isomerism?

(a) $$[Pt(NH_3$)_2Cl_2] ($$square planar)
(b) $$[Co(NH_3$)_6]Cl_3$ (octahedral)
(c) $$[Ni(CO)_4]$$ (tetrahedral)
(d) $$[Cr(H_2O)_6]$$Cl_3 ($$octahedral)

Accepted Answer

(a) only

Question 2

Which of the following best describes the geometry and possible isomerism of $$[Co(NH_3$)_4Cl_2]^+$$?

Accepted Answer

Octahedral geometry; can show geometric (cis-trans) isomerism

Question 3

Which of the following compounds is expected to be paramagnetic?

(a) $$[Fe(CN)_6]^{4-}
(b$$) $$[Fe(CN)_6]^{3-}
(c$$) $$[Co(NH_3$)_6]^{3+}
(d$$) $$[Ni(CN)_4]^{2-}$$

Accepted Answer

(b) only

Question 4

Prussian Blue has the formula $$Fe_4$$[Fe(CN)_6]_3$$. What is the oxidation state of iron in the $$[Fe(CN)_6]^{4-}$$ ion?

Accepted Answer

+2

Question 5

Which statement best explains the intense blue color of Prussian Blue ($$Fe_4$$[Fe(CN)_6]_3$$)?

Accepted Answer

It is due to charge transfer transitions between Fe(II) and Fe(III) ions.

Question 6

How many moles of unpaired electrons are present in one mole of $$Fe_4$$[Fe(CN)_6]_3$$? (Assume all Fe in $$[Fe(CN)_6]^{4-}$$ is low-spin Fe(II) and all Fe outside the complex are Fe(III)).

Accepted Answer

3

Question 7

Which of the following compounds can exhibit linkage isomerism?

Accepted Answer

$$[Co(NH_3$)_5(NO_2$)]^{2+}$$

Question 8

A solution of $$K_3$$[Cr(CN)_6]$$ is prepared. What color would you expect the solution to be?

Accepted Answer

Violet

Question 9

Which of the following best describes the hybridization and geometry of $$[Ni(CO)_4]$$?

Accepted Answer

$$sp^3$$ hybridization; tetrahedral geometry

Question 10

A laboratory reduced a sample of vanadium(IV) hydroxide with a concentrated solution of oxalic acid. The resulting solution was found to contain a mixture of a bright purple oxalate complex and unreacted oxalic acid. If the product contains $$2.578 g of $$vanadium, $$3.046 g of $$oxalic acid, and $$2.000 g $$sample of the product, what is the empirical formula of the vanadium oxalate complex?

Accepted Answer

$$[V(C_2O_4)_3]^{2-}$$

Question 11

Which of the following is true for $$[Fe(CN)_6]^{4-}$$?

Accepted Answer

It is a low-spin complex and diamagnetic.

Question 12

Which of the following statements about $$[Co(NH_3$)_6]^{3+} is $$correct?

Accepted Answer

It is an inner orbital (low-spin) complex and is diamagnetic.

Question 13

Which of the following is NOT a possible type of isomerism in $$[Pt(NH_3$)_2Cl_2]$$?

Accepted Answer

Optical isomerism

Question 14

A solution contains $$0.3648 g of$$ $$K_3$$[Fe(CN)_6]$$ per 100.0$ mL. What is the osmotic pressure at 27^	$$ext{o}C$$? (R = 0.0821$ L·atm·mol$$^{-1}$$·K$$^{-1}$$, M = 329$ g/mol, assume i = 4$)

Accepted Answer

$$1.10$$ atm

Question 15

Which of the following best describes the coordination number and geometry of $$[Cr(H_2O)_6]^{3+}$$?

Accepted Answer

6; octahedral

Question 16

Which of the following is a correct statement about the color of transition metal complexes?

Accepted Answer

The color arises from d-d transitions, which are influenced by the nature of the ligands.

Question 17

Which of the following is a possible product when $$[Co(NH_3$)_5SO_4]Br is $$dissolved in water?

Accepted Answer

$$[Co(NH_3$)_5SO_4]^+ + Br^-$$

Question 18

Which of the following is true for $$[Ni(CN)_4]^{2-}$$?

Accepted Answer

It is a square planar, diamagnetic complex.

Question 19

Which of the following best explains why $$[Fe(CN)_6]^{4-}$$ does NOT have optical isomers?

Accepted Answer

All six ligands are identical, so the complex is symmetric and cannot be chiral.

Coordination Chemistry: Isomerism, Magnetic Properties, and Complex Ions

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