CHM 116 C. 24
Coordination sphere isomers A) have the same molecular formula and coordination number. B) have the same molecular formula but different coordination numbers. C) have different molecular formulas but the same coordination number. D) have different molecular formulas and different coordination numbers. E) are the same as resonance structures.
A) have the same molecular formula and coordination number.
What is the metal ion in the porphyrin of heme? A) iron B) calcium C) molybdenum D) magnesium E) chlorophyll
A) iron
The complex [Zn(NH₃)₂Cl₂]²⁺ does not exhibit cis-trans isomerism. The geometry of this complex must be __________. A) tetrahedral B) trigonal bipyramidal C) octahedral D) square planar E) either tetrahedral or square planar
A) tetrahedral
Complexes containing metals with d⁰ electron configurations are typically colorless because A) there is no d electron that can be promoted via the absorption of visible light. B) the empty d orbitals absorb all of the visible wavelengths. C) there are no d electrons to form bonds to ligands. D) a complex must be charged to be colored. E) d electrons must be emitted by the complex in order for it to appear colored.
A) there is no d electron that can be promoted via the absorption of visible light.
What is the oxidation number of cobalt in [Co(NH₃)₄F₂]? A) -3 B) +2 C) +1 D) +3 E) +6
B) +2
What is the oxidation number of chromium in [Cr(NH₃)₄Cl₂]Cl? A) -3 B) +3 C) +2 D) -2 E) 0
B) +3
How many bonds can ethylenediamine form to a metal ion? A) 1 B) 2 C) 3 D) 4 E) 6
B) 2
How many isomers exist for the octahedral complex ion [Co(NH₃)₄F₂]⁺? A) 1 B) 2 C) 3 D) 4 E) 5
B) 2
What is the oxidation number of Ni in [Ni(CN)₅]³⁻? A) 1+ B) 2+ C) 3+ D) 4+ E) 5+
B) 2+
The coordination number for [Zn(H₂O)₃Cl]Cl is __________. A) 5 B) 4 C) 2 D) 1 E) 6
B) 4
What is the coordination number of chromium in [Cr(H₂O)₄Cl₂]⁺? A) 8 B) 6 C) 4 D) 2 E) 12
B) 6
Which one of the following species is paramagnetic? A) Cu⁺ B) Cr³⁺ C) Zn D) Ca E) Ag⁺
B) Cr³⁺
In the following reaction, Ni²⁺ is acting as a(n) __________. Ni²⁺(g) + 6H₂O(l) -> Ni(H₂O)₆²⁺(aq) A) oxidizing agent B) Lewis acid C) precipitating agent D) solvent E) ligand
B) Lewis acid
Which of the following cannot form both high- and low-spin octahedral complexes? A) Mn²⁺ B) V²⁺ C) Co³⁺ D) Cr²⁺ E) All of the above can form both high- and low-spin complexes.
B) V²⁺
What form of hemoglobin is purplish-red? A) myoglobin B) deoxyhemoglobin C) heme D) oxyhemoglobin E) none of the above
B) deoxyhemoglobin
A complex that absorbs light at 700 nm will appear __________. A) red B) green C) yellow D) orange E) violet
B) green
The "dentation" of a ligand is defined by __________. A) how many "dents" or "deceptions" there are in the coordination sphere of a complex species it forms B) how many electron donor atoms it utilizes to form coordinate bonds to the central metal ion C) the total number of lone pairs of electrons it possesses D) how many metal ions it can sequester from solution E) none of the above
B) how many electron donor atoms it utilizes to form coordinate bonds to the central metal ion
Trans -[Fe(H₂O)₂Cl₄]²⁻ must be __________. A) tetrahedral B) octahedral C) square planar D) trigonal bipyramidal E) linear
B) octahedral
Which of the following is a polydentate ligand? A) ammonia B) oxalate ion C) chloride ion D) water E) hydroxide ion
B) oxalate ion
What are the respective central-metal oxidation state, coordination number, and overall charge on the complex ion in Na₂[Cr(NH₃)₂(NCS)₄? A) +3; 6; -1 B) +3; 6; +1 C) +2; 6; -2 D) +2; 4; -1 E) +1; 6; -2
C) +2; 6; -2
What is the oxidation state of chromium in [Cr(H₂O)₄Cl₂]⁺? A) 0 B) +2 C) +3 D) -2 E) -3
C) +3
What is the oxidation state of iron in CaNa[Fe(CN)₆]? A) 0 B) +2 C) +3 D) +4 E) +6
C) +3
The names of complex anions end in __________. A) -o B) -ium C) -ate D) -ous E) -ic
C) -ate
How many d electrons are associated with the metal ion in [Cr(NH₃)₆]³⁺? A) 1 B) 2 C) 3 D) 4 E) 5
C) 3
How many ligands are there in the coordination sphere of [Co(en)₂Cl₂]⁺? A) 3 B) 6 C) 4 D) 1 E) 0
C) 4
How many d electrons are in the cobalt ion of K₃[Co(CN)₆]? A) 3 B) 5 C) 6 D) 7 E) 4
C) 6
In the compound, CaNa[Fe(CN)₆], what ligands are in the coordination sphere? A) Ca²⁺ B) Na⁺ C) CN⁻ D) H₂O E) none of the above
C) CN⁻
What is the ligand in Ca₃[Fe(CN)₆]₂? A) Ca²⁺ B) Fe³⁺ C) CN⁻ D) Fe(CN)₆³⁻ E) Fe²⁺
C) CN⁻
Which one of the following ions cannot form both a high spin and a low spin octahedral complex ion? A) Fe³⁺ B) Co²⁺ C) Cr³⁺ D) Mn³⁺ E) Cr²⁺
C) Cr³⁺
What are the donor atoms in ferrichrome and how many of them are in one molecule? A) Cr, 5 B) N, 4 C) O, 6 D) Fe, 4 E) S, 6
C) O, 6
Isomers whose ligands can bind directly to a metal or be outside the lattice are called _________. A) linkage isomers B) rotational isomers C) coordination sphere isomers D) geometric isomers E) optical isomers
C) coordination sphere isomers
The chelate effect is best attributed to considerations of which type? A) hydration B) enthalpy C) entropy D) hydrogen bonding E) resonance
C) entropy
The attraction of a metal to a neutral ligand is due to __________ bonding. A) ionic B) covalent C) ion-dipole D) dipole-dipole E) hydrophobic
C) ion-dipole
What is the most common geometry found in four-coordinate complexes? A) square planar B) octahedral C) tetrahedral D) icosahedral E) trigonal bipyramidal
C) tetrahedral
The coordination sphere of a complex consists of __________. A) the central metal ion only B) the ligands C) the central metal ion and the ligands bonded to it D) the primary and secondary valencies E) coordination and steric numbers
C) the central metal ion and the ligands bonded to it
The charge of the complex ion in [Zn(H₂O)₃Cl]Cl is __________. A) 0 B) 1- C) 2+ D) 1+ E) 2-
D) 1+
What is the charge of the central metal ion in Ca₃[Fe(CN)₆]₂? A) 0 B) 1+ C) 2+ D) 3+ E) 6+
D) 3+
How many iron atoms are coordinated in a hemoglobin molecule? A) 1 B) 2 C) 3 D) 4 E) 5
D) 4
The coordination number of cobalt in CoCl₃•5NH₃ is __________. A) 2 B) 3 C) 4 D) 6 E) 8
D) 6
What is the coordination number of iron in CaNa[Fe(CN)₆]? A) 2 B) 8 C) 4 D) 6 E) 12
D) 6
Which of the following statements is (are) false? A) The greater the energy gap in a metal complex, the shorter the wavelength of light the complex will absorb. B) Complex color depends on both the metal and the ligand. C) Metal complexes with an ammonia ligand have a larger energy gap than the corresponding fluoride complexes. D) Strong field ligands are associated with low energy gaps. E) Both A and C
D) Strong field ligands are associated with low energy gaps.
Triphenylphosphine is often given the abbreviated formula . The correct name for Rh(PPh₃)₃Cl is __________. A) chlorotriphenylphosphinerhodium B) chlorotriphenylphosphinerhodium(I) C) tris(triphenylphosphine)chlororhodium(I) D) chlorotris(triphenylphosphine)rhodium(I) E) chlorotris(triphenylphosphine)rhodate(-I)
D) chlorotris(triphenylphosphine)rhodium(I)
Metals with __________ electron configurations characteristically form diamagnetic, square planar complexes. A) d⁰ B) d⁹ C) d⁶ D) d⁸ E) d¹⁰
D) d⁸
A ligand with a single donor atom is called __________. A) a chelon B) a chelate C) polydentate D) monodentate E) bidentate
D) monodentate
The correct name for Na₃[CoF₆] is __________. A) trisodium hexakisfluorocobalt(III) B) trisodium hexakisfluorocobalt(II) C) trisodium hexakisfluorocobalt(IV) D) sodium hexafluorocobaltate(III) E) sodium hexafluorocobaltate(IV)
D) sodium hexafluorocobaltate(III)
In __________, the bonds are the same but the spatial arrangement of the atoms is different. A) structural isomers B) linkage isomers C) coordination-sphere isomers D) stereoisomers E) resonance structures
D) stereoisomers
What purpose would sodium tripolyphosphate serve in a detergent formulation? A) to aid in removal of rust stains from surfaces and from clothes B) to aid in keeping the inside of washing machines clean and free from corrosion C) to improve the flow characteristics of the detergent in the box D) to complex and hence sequester metal ions in hard water E) to reduce bacterial growth in the detergent upon storage
D) to complex and hence sequester metal ions in hard water
The coordination number and oxidation number of the central atom in [Mn(CO)₄Br₂] are _________ and _________, respectively. A) 4, +1 B) 6, +1 C) 5, +2 D) 4, +2 E) 6, +2
E) 6, +2
In humans, what percent of absorbed iron is found in blood? A) 15 B) 25 C) 40 D) 60 E) 75
E) 75
Which one of the following is a strong-field ligand? A) Cl⁻ B) NH₃ C) H₂O D) F⁻ E) CN⁻
E) CN⁻
Which one of the following species is a potential polydentate ligand (chelating agent)? A) NH₃ B) Cl⁻ C) CN⁻ D) H₂O E) C₂O₄²⁻
E) C₂O₄²⁻
Linkage isomerism would most likely occur when which of the following ligands is present? A) H₂O B) NH₃ C) Cl⁻ D) PF₃ E) NCS⁻
E) NCS⁻
Changes in the coordination sphere of a complex compound may lead to changes in __________. A) color B) physical properties C) chemical properties D) stability E) all of the above
E) all of the above
Formation of a complex species of Mⁿ⁺ metal ion with ligands often __________. A) "masks" original chemical properties of both the Mⁿ⁺ ion and the ligands B) reduces availability of the free Mⁿ⁺ ions in solution C) may cause changes in the ease with which Mⁿ⁺ is reduced or oxidized D) alters original physical properties of Mⁿ⁺ E) all of the above
E) all of the above
What transition metal is responsible for the color of ruby? A) manganese B) cobalt C) titanium D) gold E) chromium
E) chromium
Complexes containing metals with d¹⁰ electron configurations are typically __________. A) violet B) blue C) green D) yellow E) colorless
E) colorless
Complexes containing metals with which one of the following electron configurations are usually colorless? A) d² B) d¹ C) d⁵ D) d⁸ E) d¹⁰
E) d¹⁰
EDTA is __________-dantate ligand. A) mono B) bi C) tri D) tetra E) hexa
E) hexa
The correct name for [Ni(NH₃)₆](NO₃)₃ is __________. A) dinitrohexaamminenickel (II) B) hexaamminenickel (III) trinitrate C) dinitrohexaamminenickelate (III) D) hexaamminenickel (II) nitrate E) hexaamminenickel (III) nitrate
E) hexaamminenickel (III) nitrate
What metal is complexed in chlorophyll? A) iron B) chromium C) manganese D) vanadium E) magnesium
E) magnesium
Linkage isomerism can only occur __________. A) in cis-isomers of octahedral complexes B) with cobalt complexes C) with coordination number 6 D) with tetrahedral complexes E) with ligands that have more than one possible donor atom
E) with ligands that have more than one possible donor atom
The minimum number of unshared valence electron pairs in the ligands of a coordination compound is __________. A) 1 B) 2 C) 3 D) 4 E) 5
A) 1
The coordination number of platinum in complexes is always __________. A) 4 B) 5 C) 2 D) 3 E) 6
A) 4
Consider a complex in which manganese (III) is bonded to six identical ligands. Which one of the following ligands will result in the smallest value of Δ? A) Cl⁻ B) NH₃ C) H₂O D) F⁻ E) CN⁻
A) Cl⁻
Which of the following can form both high- and low-spin octahedral complexes? A) Cr²⁺ B) Cr³⁺ C) Zn²⁺ D) Cu⁺ E) All of the above can form either high- or low-spin complexes.
A) Cr²⁺
During the formation of a coordination compound, the metal acts as a __________. A) Lewis acid B) Bronsted acid C) Arrhenius acid D) Bronsted base E) Lewis base
A) Lewis acid
During the formation of a coordination compound, ligands act as __________. A) Lewis bases B) Arrhenius bases C) Bronsted acids D) Lewis acids E) Arrhenius acids
A) Lewis bases
What are the donor atoms in a porphine molecule? A) N B) O C) S D) Br E) F
A) N
Which of the following complexes has a coordination number of 6? A) [Co(en)₂Cl₂]⁺ B) [Pt(NH₃)₂Cl₂] C) [Cu(NH₃)₄]²⁺ D) [Ag(NH₃)₂]⁺ E) None of these complexes has coordination number 6.
A) [Co(en)₂Cl₂]⁺
A racemic mixture is A) an equal mixture of both enantiomers of an optically active species. B) a mixture of an optically active species with an optically inactive species. C) an equal mixture of cis- and trans-isomers. D) a mixture of metal ions and ligands in equilibrium. E) a mixture of structural isomers.
A) an equal mixture of both enantiomers of an optically active species.
Which of the following is not a chelating agent? A) chloride anion B) EDTA C) porphine D) ethylenediamine E) oxalate anion
A) chloride anion
What is the purpose of adding EDTA to prepared foods? A) to keep ions such as in solution so the foods look good B) to complex trace metal ions that catalyze decomposition reactions C) to complex iron(III) ions so they can catalyze protein decomposition on cooking D) to aid in browning of the surface during cooking E) to prevent dissolution of the container in the food when stored for long periods of time
B) to complex trace metal ions that catalyze decomposition reactions
A geometrical isomer with like groups located on opposite sides of the metal atom is denoted with the prefix __________. A) cis- B) trans- C) bis- D) tetrakis E) d-
B) trans-
A metal complex absorbs light mainly at 420 nm. What is the color of the complex? A) green B) yellow C) red D) orange E) purple
B) yellow
What is the charge on the complex ion in Ca₂[Fe(CN)₆]? A) 3- B) 2+ C) 2- D) 1- E) 4-
E) 4-
What is the charge on the complex ion in Mg₂[FeCl₆]? A) 2- B) 2+ C) 3- D) 3+ E) 4-
E) 4-
The coordination numbers of cobalt(III) and of chromium(III) in their complexes are always __________. A) 4 B) 5 C) 2 D) 3 E) 6
E) 6
What is the coordination number of cobalt in [Co(NH₃)₅Cl](NO₃)₂? A) 12 B) 8 C) 4 D) 2 E) 6
E) 6