Chemistry 151 Quiz 7 - 1
Week starting Nov. 12, 1997
ENCODE AND WRITE YOUR PID AND NAME ON THE SCANTRON SHEET NOW.
NO ENCODED PID = NO GRADE
Answer all questions on the Scantron sheet. For multiple choice questions please encode the letter of the one best
answer.
In this quiz N N and en represent ethylenediamine.
1.
(3 pts) The coordination number of the complex ion in the compound K[CrenCl2Br2] is
(a)
2.
2
(b)
4
(c)
5
NH3
(b)
Cl1-
(c)
Mg2+
Please consider the compound at the right for the next three questions.
(2 pts) The oxidation number of the Co atom is
(a)
(b)
4.
5.
6
(d)
CO
(2 pts) Which of the following is unlikely to be a ligand?
(a)
3.
(d)
0
2-
(c)
(d)
2+
3+
(4 pts) Consider the following statements about the complex ion.
(1)
(2)
(3)
The complex ion has an internal mirror plane.
The complex ion must be described as a cis isomer.
The complex ion has optical isomers.
(a)
(b)
(c)
(d)
(e)
All three statements are correct.
Only statements (1) and (2) are correct.
Only statements (2) and (3) are correct.
Only statements (1) and (3) are correct.
Only one of the three statements is correct.
(4 pts) The name of this complex ion is:
(a)
(b)
(c)
(d)
chromium ethylenediamineaquabromodichloride
aquabromoethylene-bis-chloroethylenediaminecobalt(0)
aquabromodichloroethylenediaminecobaltate(III)
aquabromo-cis-dichloroethylenediaminecobalt(0)
Chemistry 151 Quiz 7 - 2
Week starting Nov. 12, 1997
ENCODE AND WRITE YOUR PID AND NAME ON THE SCANTRON SHEET NOW.
NO ENCODED PID = NO GRADE
Answer all questions on the Scantron sheet. For multiple choice questions please encode the letter of the one best
answer.
In this quiz N N and en represent ethylenediamine.
1.
(3 pts) The coordination number of the complex ion in the compound [Cren2ClBr]Br is
(a)
2.
2
(b)
4
(c)
5
(d)
6
(2 pts) The complex ions [Cren2ClBr]Br and [Cren2Br2]Cl are called
(a)
(b)
optical isomers
linkage isomers
(c)
(d)
ionization isomers
geometrical isomers
Please consider the compound at the right for the next three questions.
3.
(2 pts) The oxidation number of the Cu atom is
(a)
(b)
4.
5.
0
2-
(c)
(d)
2+
3+
(4 pts) Consider the following statements about the complex ion.
(1)
(2)
(3)
The complex ion has an internal mirror plane.
The complex ion is a chelate complex.
The complex ion has optical isomers.
(a)
(b)
(c)
(d)
(e)
All three statements are correct.
Only statements (1) and (2) are correct.
Only statements (2) and (3) are correct.
Only statements (1) and (3) are correct.
Only one of the three statements is correct.
(4 pts) The name of this complex ion is:
(a)
(c)
dichlorodiethylenediaminecopper(II)
(b)
bis-ethylenediaminecopper(II) chloride (d)
copper-bis-ethylenediamine chloride
diethylenediaminecuprate(II) chloride
Chemistry 151 Quiz 7 - 3
Week starting Nov. 12, 1997
ENCODE AND WRITE YOUR PID AND NAME ON THE SCANTRON SHEET NOW.
NO ENCODED PID = NO GRADE
Answer all questions on the Scantron sheet. For multiple choice questions please encode the letter of the one best
answer.
In this quiz N N and en represent ethylenediamine, H2NCH2CH2NH2.
1.
(3 pts) Which compound is a chelate?
(a)
(b)
2.
3.
(c)
(d)
[Coen3]Cl3
K2[Fe(CN)5(OH2)]
(4 pts) Which of the following are bidentate ligands?
(1)
(2)
(3)
oxalate, C2O42ammonia, NH3
chloride, Cl1-
(4)
(5)
(6)
hydroxide
nitrite, NO21en
(a)
(b)
1, 4, 5
1, 6
(c)
(d)
1, 5, 6
2, 3, 4, 5
(4 pts) The correct formula of the compound whose name is hexaamminechromium(III) nitrate is
(a)
(b)
4.
[Co(NH3)5Cl]Cl2
K4[Fe(CN)6]
[Cr(NH3)6](NO3)3
[Cr(NO3)3](NH3)6
(c)
(d)
[Cr(NH2)6]NO3
[Cr(NH3)6](NO2)3
(4 pts) Which statement about the complex ion demonstrations is CORRECT?
(a)
(b)
(c)
(d)
Once a complex ion has formed it is difficult to change its ligands.
Large ligands cause tetrahedral complex ions to form.
The ions [Cu(NH3)4(OH2)2]2+ and [Cu(OH2)6]2+ are both blue, but the aqua complex has a much
deeper blue color.
The [Co(OH2)6]2+ complex ion has a deep blue color that changed to light pink when HCl(aq ) was
added.
Chemistry 151 Quiz 7 - 4
Week starting Nov. 12, 1997
ENCODE AND WRITE YOUR PID AND NAME ON THE SCANTRON SHEET NOW.
NO ENCODED PID = NO GRADE
Answer all questions on the Scantron sheet. For multiple choice questions please encode the letter of the one best
answer.
In this quiz N N and en represent ethylenediamine, H2NCH2CH2NH2.
1.
(4 pts) Use the crystal field theory to identify the strongest ligand, i.e., the ligand that will make ∆o largest.
(a)
2.
H2O
(c)
OH1-
(d)
dxy, dxz, dyz
dxy, dx2 - y2
(c)
(d)
dx2 - y2, dz2
dxz, dyz, dz2
(3 pts) What is the coordination number of [Coen(OH2)4]3+?
(a)
(b)
(c)
4.
(b)
(4 pts) In octahedral complex ions, the t2g orbitals are:
(a)
(b)
3.
F1-
0
2
4
(d)
(e)
5
6
(4 pts) What type of isomerism does the compound [Pt(NH3)2Br2] show?
(a)
(b)
optical
linkage
(c)
(d)
geometric
coordination sphere
en
Chemistry 151 Quiz 7 - 5
Week starting Nov. 12, 1997
ENCODE AND WRITE YOUR PID AND NAME ON THE SCANTRON SHEET NOW.
NO ENCODED PID = NO GRADE
Answer all questions on the Scantron sheet. For multiple choice questions please encode the letter of the one best
answer.
In this quiz N N and en represent ethylenediamine, H2NCH2CH2NH2.
1.
(4 pts) If each Ni2+ atom in NiCl2 (s) is coordinated octahedrally by Cl1- ions, crystal field theory predicts
the number of unpaired electrons on each Ni2+ atom to be
(a)
2.
(b)
3
(c)
4
(d)
5
(3 pts) What is the coordination number of the zinc ion in the complex [Znen2]Br2?
(a)
3.
2
2
(b)
3
(c)
4
(d)
6
(4 pts) In the space at the right of the answer sheet write the name of [Coen2Cl2]Br.
dichloro-bis(ethylenediamine)cobalt(III) bromide
4.
(4 pts) According to the crystal field theory, which list contains only strong field ligands?
(a)
(b)
(c)
(d)
CN1-, CO, Cl1-, Br1CN1-, NO21- (N-bonded)
H2O, Br1-, NCS1- (N-bonded)
I1-, CN1-, CO, OH1-
Chemistry 151 Quiz 7 - 6
Week starting Nov. 12, 1997
ENCODE AND WRITE YOUR PID AND NAME ON THE SCANTRON SHEET NOW.
NO ENCODED PID = NO GRADE
Answer all questions on the Scantron sheet. For multiple choice questions please encode the letter of the one best
answer.
In this quiz N N and en represent ethylenediamine, H2NCH2CH2NH2.
1.
(4 pts) Which energy diagram is representative of a low spin complex ion?
↑↑
(a)
↑
(b)
↑↓ ↑ ↑
2.
↑↑↑
↑↓ ↑↓ ↑↓
CN1-, SCN1-, Cl1SCN1-, NO21en, C2O42NH3, en, CN1-
(4 pts) Which statement is CORRECT?
(a)
(b)
(c)
(d)
4.
(c)
(4 pts) Which list contains only ligands that can form linkage isomers?
(a)
(b)
(c)
(d)
3.
↑
Strong field ligands cause complex ions to be high spin.
Strong field ligands cause complex ions to be low spin.
Large ligands favor formation of octahedral complex ions.
A small number of ligands causes complexes to be low spin.
(3 pts) Which complex ion can have geometrical isomers?
(a)
[PtCl2Br2]2-
(b)
[CoF6]3-
(c)
[CuCl4]2-
Chemistry 151 Quiz 7 - 7
Week starting Nov. 12, 1997
ENCODE AND WRITE YOUR PID AND NAME ON THE SCANTRON SHEET NOW.
NO ENCODED PID = NO GRADE
Answer all questions on the Scantron sheet. For multiple choice questions please encode the letter of the one best
answer.
1.
(4 pts) Which complex is optically active?
(a)
(b)
(c)
(d)
2.
(4 pts) Which statement about octahedral complex ions is CORRECT?
(a)
(b)
(c)
(d)
3.
(3 pts) Which compound probably contains a complex ion?
(a)
4.
The eg orbitals are destabilized by +2/5 ∆o.
Ligand electrons make occupancy of the eg orbitals by metal electrons unfavorable.
The t2g orbitals point directly toward the ligands.
The C3 rotation axis causes the dxy and dx2 - y2 orbitals to be degenerate.
KAl(SO4)2
(b)
CH3COOH
(c)
CuSO4 5H2O
(d)
NaC2H3O2
(4 pts) Which statement about the demonstrations is CORRECT?
(a)
(b)
(c)
(d)
The demonstration suggests that octahedral complex ions are more intensely colored than tetrahedral
complex ions.
Concentrated reagents are frequently needed to replace a strong field ligand with one that is less
strong.
The concentrated NH3 solution floated on the HCl solution in the [CuCl4]2- demonstration because
NH3 is a stronger ligand than is Cl1-.
Color in octahedral complex ions results when electrons 'drop' from the eg orbitals to the t2g orbitals.
Chemistry 151 Quiz 7 - 8
Week starting Nov. 12, 1997
ENCODE AND WRITE YOUR PID AND NAME ON THE SCANTRON SHEET NOW.
NO ENCODED PID = NO GRADE
Answer all questions on the Scantron sheet. For multiple choice questions please encode the letter of the one best
answer.
1.
(3 pts) If the five 3d orbitals in a complex ion are arranged
as illustrated at the right, the complex ion is probably
(a)
(c)
2.
tetrahedral
distorted octahedral
one
two
(c)
(d)
three
four
(e)
five
(4 pts) Select the CORRECT formula for the compound
sodium aquatrichloroethylenediaminecobaltate(II)
(a)
(c)
4.
(b)
(d)
(4 pts) The molecule [Pt(NH3)(OH2)BrCl] is square planar. How many geometric isomers of this molecule
can exist?
(a)
(b)
3.
octahedral
square planar
Na[Coen(OH2)3Cl]
Na[Co(NH3)(OH2)Cl3]
(b)
(d)
[Co(OH)enCl3]Na
Na[Coen(OH2)Cl3]
(4 pts) Which complex ion is expected to be an outer orbital complex?
(a)
(c)
[Fe(OH2)6]3+
[Fe(CN)6]4-
(b)
(d)
[CrF6]3[V(OH2)6]3+
Chemistry 151 Quiz 7 - 9
Week starting Nov. 12, 1997
ENCODE AND WRITE YOUR PID AND NAME ON THE SCANTRON SHEET NOW.
NO ENCODED PID = NO GRADE
Answer all questions on the Scantron sheet. For multiple choice questions please encode the letter of the one best
answer.
1.
(3 pts) Which is the correct name for the compound K[Ag(CN)2]?
(a)
(b)
(c)
(d)
2.
(4 pts) Which statement about octahedral complex ions is correct?
(a)
(b)
(c)
(d)
3.
A C3 axis makes the dxy, dxz and dyz orbitals indistinguishable, or degenerate.
A C3 axis destabilizes the dxy, dxz and dyz orbitals relative to the dx 2 - y 2 and dz 2 orbitals.
The t2g orbitals are destabilized by +3/5 ∆o.
The donor atoms of the ligands point directly toward the dxy, dxz and dyz orbitals.
(4 pts) Identify the CORRECT statement about octahedral complex ions.
(a)
(b)
(c)
(d)
4.
potassium dicyanosilver(I)
potassium silverdicyanide(1-)
potassium dicyanoargentate(I)
bis(cyano)silver(I) potassium
All Cr3+ complex ions will have unpaired spins.
Most cyano complex ions are high spin.
The dx 2 - y 2 and dz 2 orbitals are called t2g orbitals.
In general, strong field ligands have filled p-type atomic orbitals.
(4 pts) Which statement about the demonstrations is CORRECT?
(a)
(b)
(c)
(d)
All three demonstrations suggested that tetrahedral complex ions are less-intensely colored than
octahedral complex ions.
The white smoke that appeared when concentrated NH3 was added to the [CuCl4]2- complex ion was
NH4Cl (s) .
The [Cu(NH3)4(OH2)2]2+ complex ion has a light green color.
The copper complex ion demonstrations suggested that the Cl1- and Br1- ions are better Lewis bases
than H2O or NH3(aq ).
Chemistry 151 Quiz 7 - 10
Week starting Nov. 12, 1997
ENCODE AND WRITE YOUR PID AND NAME ON THE SCANTRON SHEET NOW.
NO ENCODED PID = NO GRADE
Answer all questions on the Scantron sheet. For multiple choice questions please encode the letter of the one best
answer.
1.
(3 pts) Which statement is CORRECT?
(a)
(b)
(c)
(d)
2.
A low spin complex results when ∆o exceeds the energy required to pair electrons, P.
A high spin complex is never paramagnetic.
Ligands like NO21- and CN1- usually produce high spin complex ions.
A low spin complex ion is always diamagnetic.
(4 pts) Which species has a three-fold C3 rotation axis?
(c)has the C3
rotation axis
3.
(4 pts) Which compound can exhibit ionization isomerism?
(a)
(b)
4.
[PtCl2(NH3)2]
[Cr(OH2)4Br2]Cl2
(c)
(d)
K3[CoCl6]
[Co(NO2)3(NH3)3]
(4 pts) Which statement about the demonstrations is CORRECT?
(a)
(b)
(c)
(d)
The [CuCl4]2- ion has a square planar shape.
Concentrated HBr(aq ) was needed to form the [CuBr4]2- ion because the Cu aqua complex is more
stable than the tetrabromocuprate(2-) complex.
Large ligands tend to form octahedral complex ions.
The [Cu(OH2)6]2+ ion is more intensely colored than the [CuBr4]2- ion.