Deck 24: Complex Ions and Coordination Compounds

Question 1

Which of the following metal ions has coordination numbers of 2 or 4?

A)Fe³⁺
B)Co³⁺
C)Cu⁺
D)Pt²⁺
E)Cr³⁺

Answer 1

Cu⁺

Question 2

A monodentate ligand can have only one lone pair of electrons.

Answer 2

False

Question 3

Some wavelengths of light are the correct energy to be used to promote electrons to higher energy levels and are thus lost from white light.The loss of these wavelengths causes solutions of transition elements to be colored.

Answer 3

True

Question 4

The [Fe(CN)₆]^3- complex ion:

A)exhibits square planar geometry
B)is diamagnetic
C)exhibits octahedral geometry
D)has two unpaired electrons
E)has four unpaired electrons

Question 5

Choose the INCORRECT formula/name combination for ligands.

A)Br^- / bromo
B)S₂O₃^2- / sulfato
C)NO₂^- bonded to N / nitrito-N-
D)NO₂^- bonded to O / nitrito-O-
E)en (ethylenediamine)/ N₂NCH₂CH₂NH₂

Question 6

Enantiomers are isomers which are not chiral.

Question 7

Complex-ion formation can be described in terms of Br∅nsted-Lowry acid-base reactions.

Question 8

Which of the following metal ions can have coordination numbers of either 4 or 6?

A)Ag⁺
B)Ca²⁺
C)Cu⁺
D)Ni²⁺
E)Au⁺

Question 9

Choose the INCORRECT formula/name combination for ligands.

A)C₅H₅N / pyridine
B)F^- / fluoro
C)Cl^- / chloro
D)OH^- / hydroxo
E)I^- / iodino

Question 10

The overall formation constant can be calculated by multiplying the constant for each step of the formation.

Question 11

Sequestering is using a chelating agents to reduce a free cation concentration to the point that the cation will not react to form objectionable products.

Question 12

Which combination of central species and net charge is FALSE for complex ions or coordination compounds?

A)neutral metal atom,positive net charge
B)neutral metal atom,zero net charge
C)metal cation,zero net charge
D)metal cation,positive net charge
E)metal cation,negative net charge

Question 13

Complex-ions in which ligands are interchanged very slowly are called labile.

Question 14

High spin refers to the maximum number of ligands attached to the metal ion.

Question 15

Unpaired electrons cause a complex ion to be diamagnetic.

Question 16

Choose the INCORRECT formula/name combination for ligands.

A)O^2- / hydroxo
B)NO / nitrosyl
C)I^- / iodo
D)CN^- / cyano
E)SO₄^2- / sulfato

Question 17

Choose the INCORRECT statement.

A)The coordination number is the number of ligands which can attach to a metal center.
B)A ligand supplies one or more electron pairs to bond to the metal ion.
C)The ligand-metal ion bond is a coordinate covalent bond.
D)A ligand is a Lewis base.
E)A ligand that donates a pair of electrons is multidentate.

Question 18

A complex is any species involving coordination of ligands to a metal center.

Question 19

Choose the INCORRECT statement.

A)A ligand that bonds to the metal ion with more than one atom is unidentate.
B)A chelate is produced by a ligand bonding to the metal ion with two or more donor atoms.
C)In coordination nomenclature,the cations are named before the anions.
D)In coordination nomenclature,the names of the ligands are followed by the name of the central metal ion.
E)Anionic ligands end in -o in coordination nomenclature.

Question 20

Choose the INCORRECT formula/name combination for ligands.

A)H₂O / aqua
B)NH₃ / ammine
C)CO / carbonyl
D)NO / nitrito-N-
E)CH₃NH₂ / methylamine

Question 21

Coordination isomerism could be shown by:

A)Li[AlH₄]
B)[Ag(NH₃)₂][CuCl₂]
C)[Co(NH₃)₄Cl₂]Br
D)[Pt(H₂O)₄Cl₂]
E)[Fe(CN)₆](NH₃)₃

Question 22

It is known that the sulfhydryl group,^-SH,forms strong coordinate bonds to certain heavy metal ions.Which of the following do you expect to be the best chelating agent for heavy metal ions?

A)HS-CH₂-CH(SH)-CH₂-OH
B)H-SH
C)CH₃-SH
D)CH₃-S-S-CH₃
E)SO₄^2-

Question 23

Which of the following ligand names is INCORRECT?

A)F^-/fluoro
B)OH^-/hydroxo
C)NH₃/ammino
D)NO₂^-/nitrito
E)SO₄^2-/sulfato

Question 24

Choose the INCORRECT statement.

A)Structures that are nonsuperimposable mirror images are enantiomers.
B)Enantiomers are chiral.
C)Enantiomers are optical isomers.
D)Hydrates are molecules which do not react with water.
E)Coordination complexes add the ligands one at a time.

Question 25

Which of the following is a bidentate ligand?

A)H₂O
B)NO₂^-
C)NH₃
D)H₂NCH₂CH₂NH₂
E)[(O₂C)₂NCH₂CH₂N(CO₂)₂]^4-

Question 26

When [Ni(NH₃)₄]²⁺ is treated with concentrated HCl(aq),two compounds having the same formula,[Ni(NH₃)₄Cl₂],designated I and II,are formed.Compound I can be converted to compound II by boiling it in dilute HCl(aq).A solution of I reacts with oxalic acid,H₂C₂O₄,to form [Ni(NH₃)₄(C₂O₄)].Compound II does not react with oxalic acid.Compound II is:

A)the cis isomer
B)tetrahedral in shape
C)the trans isomer
D)the same as compound I
E)octahedral in shape

Question 27

Which one of the following could be a chelating ligand?

A)NH₃
B)CH₃-CH₂-NH₂
C)NH₂-CH₂-CH₂-NH₂
D)CN^-
E)any metal ion

Question 28

Which element possesses the smallest number of unpaired electrons?

A)Co
B)Cr
C)Cu
D)Mn
E)Fe

Question 29

Choose the correct shape,weak or strong field,and number of unpaired electrons for [Co(NH₃)₆]³⁺.

A)square planar,strong,6
B)square planar,weak,0
C)tetrahedral,strong,0
D)octahedral,strong,0
E)octahedral,weak,6

Question 30

Choose the correct shape,weak or strong field,and number of unpaired electrons for [CoCl₄]^2-.

A)square planar,strong,3
B)square planar,strong,0
C)tetrahedral,strong,1
D)tetrahedral,weak,3
E)square planar,weak,0

Question 31

Which of the following ligands exerts the strongest field?

A)I^-
B)H₂O
C)ONO^-
D)NH₃
E)Br^-

Question 32

Which complex ion possesses the largest number of unpaired electrons?

A)[CoCl₄]^2-
B)[Cr(NH₃)₆]²⁺
C)[Cu(NH₃)₄]²⁺
D)[Mn(CN)₆]^4-
E)[Fe(H₂O)₆]³⁺

Question 33

Choose the INCORRECT statement about isomers.

A)Structural isomers differ in structure or bond type.
B)stereoisomers differ in the spatial arrangements among the ligands.
C)Ionization isomers differ in the charge on the central ion.
D)Linkage isomers differ in which atom is bonded to the central atom.
E)Geometric isomerism is cis-trans isomerism.

Question 34

Choose the correct statement about isomers of [Pt(H₂O)₂(NH₃)Cl]Br.

A)I is cis,II is trans.
B)The two molecules are the same.
C)The two molecules are the same but one is turned over.
D)They are not isomers.
E)I is trans,II is cis.

Question 35

Choose the INCORRECT statement about coordination nomenclature.

A)Molecular ligands carry the molecule's name.
B)The number of ligands is specified by a superscript.
C)Ligands are named in alphabetical order.
D)A Roman numeral designates the oxidation state of the metal ion.
E)Complex anions have an ate ending on the central metal's name.

Question 36

Choose the INCORRECT formula/name combination for ligands.

A)-O₂C-CO₂^- / oxalato (ox)
B)S₂O₃^2- / thiosulfato
C)CH₃NH₂ / ammino
D)SCN^- bonded to S / thiocyanato-S-
E)NCS^- bonded to N / thiocyanato-N-

Question 37

Choose the INCORRECT statement.

A)One popular chelating agent is EDTA.
B)[Cr(NH₃)₄Br]Cl and [Cr(NH₃)₄Cl]Br are examples of ionization isomerism.
C)Linkage isomers differ in the spatial arrangements among the ligands.
D)A tetrahedral complex cannot have a geometric isomer.
E)Enantiomers are optical isomers.

Question 38

Which of the following ligands cannot act as a chelating agent?

A)nitrite ion
B)ethylenediamine
C)ethylenediaminetetracetate ion
D)hydrazine
E)oxalate ion

Question 39

The compound PtCl₂(en)₂ [en = H₂NCH₂NH₂] is octahedral;therefore we know that:

A)en must be a monodentate ligand
B)two moles of Cl^- per mole of PtCl₂(en)₂ can be precipitated rapidly by the addition of Ag⁺
C)the molecule is nonpolar
D)the compound can have cis and trans isomers
E)Pt always has a coordination of 4

Question 40

Choose the correct shape,weak or strong field,and number of unpaired electrons for [PtCl₆]^2-.

A)square planar,weak,0
B)square planar,strong,4
C)tetrahedral,weak,0
D)octahedral,weak,1
E)octahedral,weak,4

Question 41

Choose the correct shape,weak or strong field,and number of unpaired electrons for [Co(ox)₃]^4-.

A)tetrahedral,weak,3
B)tetrahedral,strong,3
C)square planar,strong,3
D)octahedral,weak,3
E)octahedral,strong,5

Question 42

If a central ion has a coordination number of 4 we might expect the geometry of the complex ion to be ________.

A)octahedral
B)cubical
C)trigonal bipyramidal
D)square planar
E)trigonal planar

Question 43

Choose the correct shape,weak or strong field,and number of unpaired electrons for [CoI₆]^3-.

A)tetrahedral,strong,2
B)tetrahedral,weak,4
C)square planar,strong,0
D)octahedral,strong,5
E)octahedral,weak,4

Question 44

What is the approximate concentration of free Ni²⁺(aq)remaining at equilibrium in a solution prepared by mixing 5.0 mL of 0.10 M NiCl(aq)₂ with 5.0 mL of 2.0 M NH₃(aq)?
[The net formation constant for the hexamminenickel(II)ion is 5.5 × 10⁸.]

A)1.8 × 10^-9 M
B)7.7 × 10^-10 M
C)1.3 × 10^-10 M
D)2.4 × 10^-10 M
E)0.050 M

Question 45

Choose the correct shape,weak or strong field,and number of unpaired electrons for [Co(NH₃)₄]²⁺.

A)octahedral,weak,3
B)octahedral,strong,3
C)square planar,strong,1
D)tetrahedral,weak,1
E)tetrahedral,strong,1

Question 46

What is the approximate concentration of free Cu²⁺(aq)remaining at equilibrium in a solution prepared by mixing 5.0 mL of 0.10 M CuCl₂(aq)with 5.0 mL of 2.0 M aqueous ethylenediamine?
[The net formation constant for the bis(ethylenediaminecopper(II)ion is 1 × 10²⁰.]

A)9 × 10^-22 M
B)7 × 10^-22 M
C)2 × 10^-22 M
D)1 × 10^-21 M
E)6 × 10^-22 M

Question 47

What is the concentration of Cu²⁺(aq)if 0.235 g of CuCl₂(s)is dissolved in 300.0 mL of 0.550 M NH₃(aq)?
K_f ([Cu(NH₃)₄]²⁺)= 1.1 × 10¹³

A)5.8 × 10^-15 M
B)1.0 × 10^-15 M
C)6.9 × 10^-15 M
D)5.8 × 10^-3 M
E)1.2 × 10^-12 M

Question 48

In the cation [CoCl₂(en)₂]⁺,the oxidation state of cobalt and its coordination number,respectively,are ________.

A)-3 and two
B)+2 and six
C)+4 and four
D)+3 and six
E)-4 and six

Question 49

Of the following complex ions,two appear violet in aqueous solution,one appears purple,one appears blue-green,and one appears yellow.Which is yellow?

A)[Cr(H₂O)₆]³⁺
B)[CrCl(H₂O)₅]²⁺
C)[CrCl(NH₃)₅]²⁺
D)[CrCl₂(NH₃)₄]⁺
E)[Cr(NH₃)₆]³⁺

Question 50

Choose the correct shape,weak or strong field,and number of unpaired electrons for [Ni(C₂O₄)₃]^4-.

A)square planar,strong,4
B)octahedral,weak,2
C)square planar,weak,0
D)tetrahedral,weak,0
E)octahedral,weak,3

Question 51

What is the approximate concentration of free Ni²⁺(aq)remaining at equilibrium in a solution prepared by mixing 5.0 mL of 0.10 M NiCl₂(aq)with 5.0 mL of 2.00 M aqeous ethylenediamine?
[The net formation constant for the tris(ethylenediaminenickel(II)ion is 2.1 × 10¹⁸.]

A)0.050 M
B)1.4 × 10^-19 M
C)4.8 × 10^-19 M
D)3.9 × 10^-20 M
E)2.8 × 10^-20 M

Question 52

In the cation [CrCl₂(H₂O)₄]⁺,the oxidation state of chromium and its coordination number,respectively,are ________.

A)-3 and two
B)+3 and six
C)0 and four
D)+2 and six
E)-4 and six

Question 53

In the compound K₄[Fe(CN)₆],the oxidation state of iron and its coordination number,respectively,are ________.

A)-4 and ten
B)0 and ten
C)+4 and four
D)+2 and six
E)-4 and six

Question 54

What is the concentration of Ag⁺(aq)if 0.125 g of AgC₂H₃O₂(s)is placed in 100.0 mL of 1.00 M NH₃(aq)?
K_f = 1.6 × 10⁷ for [Ag(NH₃₎₂]⁺

A)4.8 × 10^-10 M
B)5.6 × 10^-10 M
C)8.0 × 10^-8 M
D)8.3 × 10^-6 M
E)7.5 × 10^-3 M

Question 55

What is the concentration of Zn²⁺(aq)if 0.254 g of ZnCl₂(s)is dissolved in 200.0 mL of 2.00 M NH₃(aq)?
K_f ([Zn(NH₃)₄]²⁺)= 4.1 × 10⁸

A)0.0093 M
B)1.5 × 10^-12 M
C)2.4 × 10^-9 M
D)2.3 × 10^-12 M
E)0.0019 M

Question 56

Using the stepwise formation constants given,calculate the net formation constant for the [Cu(H₂NCH₂CH₂NH₂)₂]²⁺ complex.
Cu²⁺ + en → [Cu(en)]²⁺ K₁ = 5.2 × 10¹⁰
[Cu(en)]²⁺ + en → [Cu(en)₂]²⁺ K₂ = 2.0 × 10⁹

A)2.6 × 10¹
B)2.5 × 10⁹
C)5.4 × 10¹⁰
D)7.9 × 10¹⁹
E)1.0 × 10²⁰

Question 57

A compound has the empirical formula CoCl₃ ∙ 5NH₃.One mole of it yields two moles of silver chloride when treated with silver nitrate.Ammonia is not removed by treatment with concentrated sulfuric acid.A reasonable formula for the compound is ________.

A)[Co(NH₃)₅]Cl₃
B)CoCl₃ ∙ 5NH₃
C)[Co(NH₃)₄Cl]Cl₂ ∙ NH₃
D)[Co(NH₃)₅Cl]Cl₂
E)[Co(NH₃)₄Cl₂]Cl ∙ NH₃

Question 58

What is the concentration of Ni²⁺(aq)if 0.223 g of NiCl₂(s)is dissolved in 250.0 mL of 0.760 M NH₃(aq)?
K_f ([Ni(NH₃)₆]²⁺)= 5.5 × 10⁸

A)6.9 × 10^-3 M
B)7.6 × 10^-11 M
C)1.3 × 10^-11 M
D)9.7 × 10^-11 M
E)1.4 × 10^-11 M

Question 59

The hexaaquachromium(III)ion absorbs light in the green part of the visible spectrum,thereby appearing to have the color:

A)blue
B)cyan
C)green
D)purple
E)yellow

Question 60

What is the approximate concentration of free Fe²⁺(aq)remaining at equilibrium in a solution prepared by mixing 5.0 mL of 0.10 M FeSO₄(aq)with 5.0 mL of 2.0 M KCN(aq)? [The net formation constant for the hexacyanoferrate(II)ion is 1 × 10³⁷.]

A)3 × 10^-22 M
B)7 × 10^-30 M
C)4 × 10^-38 M
D)5 × 10^-37 M
E)4 × 10^-40 M

Question 61

Conductivity experiments indicate that dichlorotetraamine-palladium (IV)chloride is composed of 3 moles of ions per mole of compound.However,only 2 moles of AgCl per mole of compound are precipitated rapidly when silver nitrate solution is added to a solution of the palladium compound.What is the probable structure of the complex ion?

A)octahedral
B)square planar
C)tetrahedral
D)linear
E)trigonal planar

Question 62

What is the correct IUPAC name for K₃[Co(NO₂)₆]?

A)tripotassiumhexanitritocobalt(0)
B)tripotassiumhexanitritocobalt(III)
C)potassium hexanitritocobaltate(III)
D)potassium hexanitritocobalt(III)
E)potassium hexanitratocobalt(III)

Question 63

Give the correct name for [Fe(H₂O)₄(OH)₂]⁺.

A)diaquotetrahydroxoiron(III)
B)tetrahydroxodiaquoferrate(III)
C)hydrated iron hydroxide
D)tetrawaterdihydroxoiron(III)
E)tetraaquadihydroxoiron(III)

Question 64

Give the correct name for [Fe(CN)₆]^4-.

A)hexayanoiron(II)
B)iron hexacyanide
C)hexacyanoferrate(II)
D)hexacyanide iron(II)
E)hexacyanoferrate(III)

Question 65

The two different compounds [Cu(NH₃)₄][Fe(CN)₄(H₂O)₂] and [Cu(CN)₄]Fe(NH₃)4(H₂O)₂] are examples of ________.

A)optical isomers
B)linkage isomers
C)ionization isomers
D)geometric isomers
E)coordination isomers

Question 66

Give the correct name for [Ni(NH₃)₄]²⁺.

A)tetraamminonickelate(II)
B)nickel amine
C)tetraamminenickel(II)
D)nickel tetraamine
E)tetraamminonickel(IV)

Question 67

A compound has the empirical formula CoCl₃ ∙ 5NH₃.One mole of it yields three moles of silver chloride when treated with silver nitrate.Ammonia is not removed by treatment with concentrated sulfuric acid.A reasonable formula for the compound is ________.

A)[Co(NH₃)₅]Cl₃
B)CoCl₃ ∙ 5NH₃
C)[Co(NH₃)₄Cl]Cl₂ ∙ NH₃
D)[Co(NH₃)₅Cl]Cl₂
E)[Co(NH₃)₄Cl₂]Cl ∙ NH₃

Question 68

The difference between coordination of Co²⁺ with NO₂^- by an oxygen-cobalt bonding compared to a nitrogen-cobalt bonding results in ________.

A)coordination isomers
B)geometric isomers
C)ionization isomers
D)linkage isomers
E)optical isomers

Question 69

Molecules which are nonsuperimposable mirror images of each other are called ________.

A)achiralomers
B)enantiomers
C)diastereomers
D)cis/trans isomers
E)geometers

Question 70

Isomers such as the two forms of the ion [Co(NH₃)₂Cl₄]^- that differ only in the way the atoms are oriented in space are called,in general ________.

A)ionization isomers
B)crystal field isomers
C)hybridization isomers
D)optical isomers
E)cis-trans isomers

Question 71

Give the correct name for [Al(H₂O)₄]³⁺.

A)hydrated aluminum
B)aluminum hydrate
C)tetraaquoaluminate(VI)
D)tetraaquaaluminum(III)
E)tetrawateraluminum(IV)

Question 72

Write the correct formula for tetrachloroplatinate (II)ion.

A)[PtCl₄]^2-
B)PtCl₃Cl
C)[Pt₄Cl]^-
D)[PtCl₃]^-Cl^-
E)[PtCl₂]₄²⁺

Question 73

Give the correct name for [Fe(CO)₄].

A)tetracarbonyliron(0)
B)iron carbon monoxide
C)carbonylferrate(IV)
D)tetracarbonylferrate(0)
E)iron carbonyl

Question 74

The correct name for [Ag(NH₃)₂]⁺ is ________.

A)silver amide
B)diamminesilver(I)ion
C)silver ammoniate
D)silver nitride
E)silver(I)diammine ion

Question 75

What is the correct IUPAC name for [Co(NH₃)₆]²⁺?

A)hexammoniacobaltate(II)
B)hexaamminecobaltate(II)
C)hexammoniacobalt(II)
D)hexaamminecobalt(II)
E)hexaamminecobaltium(II)

Question 76

Give the correct name for [AuF₄]^-.

A)gold fluoride
B)tetrafluoroaurate(III)
C)gold tetrafluoride
D)tetrafluorogold(III)
E)tetrafluoride gold

Question 77

The correct formula of triamminediaquachlorocobalt (III)iodide is ________.

A)[Co(NH₃)₂(H₂O)₃Cl]I₂
B)[Co(NH₃)₃(H₂O)₂Cl]I₃
C)[Co(NH₃)₃(H₂O)₂Cl]I₂
D)[Co(NH₃)₃(H₂O)₂Cl]I
E)[Co(NH₃)₃(H₂O)₂I]Cl₂

Question 78

Which of the following complexes has no geometric isomers?

A)[Pt(NH₃)₄F₂]
B)[Pt(NH₃)F₅]^-3
C)[Co(NH₃)₄F₂]⁺
D)[Co(NH₃)₃F₃]
E)[Co(NH₃)₂F₄]^-

Question 79

What is the correct name of the following ion: [Zn(CN)₄]^2-

A)zinc quadracyanide
B)tetracyanozincate(II)
C)zinc cyanide
D)tetracyanozinc(II)
E)cyanozinc(IV)

Question 80

What is the correct IUPAC name for [AuCl₄(H₂O)₂]^-?

A)diaquatetrachloroaurate(III)
B)diaquatetrachloroaurate(I)
C)diaquatetrachlorogold(III)
D)diaquatetrachlorogold(I)
E)diaquatetrachlorogoldate(III)