Chemistry 151 Quiz 7-1 Week starting Nov. 12, 1997
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1 Chemistry 151 Quiz 7-1 In this quiz N N and en represent ethylenediamine. 1. (3 pts) The coordination number of the complex ion in the compound K[CrenCl 2 Br 2 ]is (2 pts) Which of the following is unlikely to be a ligand? NH 3 Cl 1- Mg 2+ CO Please consider the compound at the right for the next three questions. 3. (2 pts) The oxidation number of the Co atom is (4 pts) Consider the following statements about the complex ion. (1) The complex ion has an internal mirror plane. (2) The complex ion must be described as a cis isomer. (3) The complex ion has optical isomers. (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. 5. (4 pts) The name of this complex ion is: chromium ethylenediamineaquabromodichloride aquabromoethylene-bis-chloroethylenediaminecobalt(0) aquabromodichloroethylenediaminecobaltate(iii) aquabromo-cis-dichloroethylenediaminecobalt(0)
2 Chemistry 151 Quiz 7-2 In this quiz N N and en represent ethylenediamine. 1. (3 pts) The coordination number of the complex ion in the compound [Cren 2 ClBr]Br is (2 pts) The complex ions [Cren 2 ClBr]Br and [Cren 2 Br 2 ]Cl are called optical isomers ionization isomers linkage 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 (4 pts) Consider the following statements about the complex ion. (1) The complex ion has an internal mirror plane. (2) The complex ion is a chelate complex. (3) The complex ion has optical isomers. (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. 5. (4 pts) The name of this complex ion is: dichlorodiethylenediaminecopper(ii) copper-bis-ethylenediamine chloride bis-ethylenediaminecopper(ii) chloride diethylenediaminecuprate(ii) chloride
3 Chemistry 151 Quiz 7-3 In this quiz N N and en represent ethylenediamine, H 2 NCH 2 CH 2 NH (3 pts) Which compound is a chelate? [Co(NH 3 ) 5 Cl]Cl 2 [Coen 3 ]Cl 3 K 4 [Fe(CN) 6 ] K 2 [Fe(CN) 5 (OH 2 )] 2. (4 pts) Which of the following are bidentate ligands? (1) 2- oxalate, C 2 O 4 (4) hydroxide (2) ammonia, NH 3 (5) 1- nitrite, NO 2 (3) chloride, Cl 1- (6) en 1, 4, 5 1, 5, 6 1, 6 2, 3, 4, 5 3. (4 pts) The correct formula of the compound whose name is hexaamminechromium(iii) nitrate is [Cr(NH 3 ) 6 ](NO 3 ) 3 [Cr(NH 2 ) 6 ]NO 3 [Cr(NO 3 ) 3 ](NH 3 ) 6 [Cr(NH 3 ) 6 ](NO 2 ) 3 4. (4 pts) Which statement about the complex ion demonstrations is CORRECT? Once a complex ion has formed it is difficult to change its ligands. Large ligands cause tetrahedral complex ions to form. The ions [Cu(NH 3 ) 4 (OH 2 ) 2 ] 2+ and [Cu(OH 2 ) 6 ] 2+ are both blue, but the aqua complex has a much deeper blue color. The [Co(OH 2 ) 6 ] 2+ complex ion has a deep blue color that changed to light pink when HCl(aq ) was added.
4 Chemistry 151 Quiz 7-4 In this quiz N N and en represent ethylenediamine, H 2 NCH 2 CH 2 NH (4 pts) Use the crystal field theory to identify the strongest ligand, i.e., the ligand that will make o largest. F 1- H 2 O OH 1- en 2. (4 pts) In octahedral complex ions, the t 2g orbitals are: d xy,d xz,d yz d x 2 -y 2,d z 2 d xy,d x 2 -y 2 d xz, d yz,d z 2 3. (3 pts) What is the coordination number of [Coen(OH 2 ) 4 ] 3+? (e) (4 pts) What type of isomerism does the compound [Pt(NH 3 ) 2 Br 2 ] show? optical geometric linkage coordination sphere
5 Chemistry 151 Quiz 7-5 In this quiz N N and en represent ethylenediamine, H 2 NCH 2 CH 2 NH (4 pts) If each Ni 2+ atom in NiCl 2 (s) is coordinated octahedrally by Cl 1- ions, crystal field theory predicts the number of unpaired electrons on each Ni 2+ atom to be (3 pts) What is the coordination number of the zinc ion in the complex [Znen 2 ]Br 2? (4 pts) In the space at the right of the answer sheet write the name of [Coen 2 Cl 2 ]Br. dichloro-bis(ethylenediamine)cobalt(iii) bromide 4. (4 pts) According to the crystal field theory, which list contains only strong field ligands? CN 1-, CO, Cl 1-,Br 1- CN 1-,NO 1-2 (N-bonded) H 2 O, Br 1-, NCS 1- (N-bonded) I 1-,CN 1-, CO, OH 1-
6 Chemistry 151 Quiz 7-6 In this quiz N N and en represent ethylenediamine, H 2 NCH 2 CH 2 NH (4 pts) Which energy diagram is representative of a low spin complex ion? 2. (4 pts) Which list contains only ligands that can form linkage isomers? CN 1-, SCN 1-,Cl 1- SCN 1-1-,NO 2 2- en, C 2 O 4 NH 3, en, CN 1-3. (4 pts) Which statement is CORRECT? 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. 4. (3 pts) Which complex ion can have geometrical isomers? [PtCl 2 Br 2 ] 2- [CoF 6 ] 3- [CuCl 4 ] 2-
7 Chemistry 151 Quiz (4 pts) Which complex is optically active? 2. (4 pts) Which statement about octahedral complex ions is CORRECT? The e g orbitals are destabilized by +2/5 o. Ligand electrons make occupancy of the e g orbitals by metal electrons unfavorable. The t 2g orbitals point directly toward the ligands. The C 3 rotation axis causes the d xy and d x 2 2 -y orbitals to be degenerate. 3. (3 pts) Which compound probably contains a complex ion? KAl(SO 4 ) 2 CH 3 COOH CuSO 4 5H 2 O NaC 2 H 3 O 2 4. (4 pts) Which statement about the demonstrations is CORRECT? 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 NH 3 solution floated on the HCl solution in the [CuCl 4 ] 2- demonstration because NH 3 is a stronger ligand than is Cl 1-. Color in octahedral complex ions results when electrons 'drop' from the e g orbitals to the t 2g orbitals.
8 Chemistry 151 Quiz (3 pts) If the five 3d orbitals in a complex ion are arranged as illustrated at the right, the complex ion is probably octahedral tetrahedral square planar distorted octahedral 2. (4 pts) The molecule [Pt(NH 3 )(OH 2 )BrCl] is square planar. How many geometric isomers of this molecule can exist? one three (e) five two four 3. (4 pts) Select the CORRECT formula for the compound sodium aquatrichloroethylenediaminecobaltate(ii) Na[Coen(OH 2 ) 3 Cl] [Co(OH)enCl 3 ]Na Na[Co(NH 3 )(OH 2 )Cl 3 ] Na[Coen(OH 2 )Cl 3 ] 4. (4 pts) Which complex ion is expected to be an outer orbital complex? [Fe(OH 2 ) 6 ] 3+ [CrF 6 ] 3- [Fe(CN) 6 ] 4- [V(OH 2 ) 6 ] 3+
9 Chemistry 151 Quiz (3 pts) Which is the correct name for the compound K[Ag(CN) 2 ]? potassium dicyanosilver(i) potassium silverdicyanide(1-) potassium dicyanoargentate(i) bis(cyano)silver(i) potassium 2. (4 pts) Which statement about octahedral complex ions is correct? A C 3 axis makes the d xy, d xz and d yz orbitals indistinguishable, or degenerate. A C 3 axis destabilizes the d xy, d xz and d yz orbitals relative to the d x 2 -y 2 and d z 2 orbitals. The t 2g orbitals are destabilized by +3/5 o. The donor atoms of the ligands point directly toward the d xy, d xz and d yz orbitals. 3. (4 pts) Identify the CORRECT statement about octahedral complex ions. All Cr 3+ complex ions will have unpaired spins. Most cyano complex ions are high spin. The d x 2 -y 2 and d z 2 orbitals are called t 2g orbitals. In general, strong field ligands have filled p-type atomic orbitals. 4. (4 pts) Which statement about the demonstrations is CORRECT? All three demonstrations suggested that tetrahedral complex ions are less-intensely colored than octahedral complex ions. The white smoke that appeared when concentrated NH 3 was added to the [CuCl 4 ] 2- complex ion was NH 4 Cl (s). The [Cu(NH 3 ) 4 (OH 2 ) 2 ] 2+ complex ion has a light green color. The copper complex ion demonstrations suggested that the Cl 1- and Br 1- ions are better Lewis bases than H 2 OorNH 3 (aq ).
10 Chemistry 151 Quiz (3 pts) Which statement is CORRECT? A low spin complex results when o exceeds the energy required to pair electrons, P. A high spin complex is never paramagnetic. Ligands like NO 1-2 and CN 1- usually produce high spin complex ions. A low spin complex ion is always diamagnetic. 2. (4 pts) Which species has a three-fold C 3 rotation axis? has the C 3 rotation axis 3. (4 pts) Which compound can exhibit ionization isomerism? [PtCl 2 (NH 3 ) 2 ] K 3 [CoCl 6 ] [Cr(OH 2 ) 4 Br 2 ]Cl 2 [Co(NO 2 ) 3 (NH 3 ) 3 ] 4. (4 pts) Which statement about the demonstrations is CORRECT? The [CuCl 4 ] 2- ion has a square planar shape. Concentrated HBr(aq ) was needed to form the [CuBr 4 ] 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(OH 2 ) 6 ] 2+ ion is more intensely colored than the [CuBr 4 ] 2- ion.
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