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21) Choose the INCORRECT formula/name combination for ligands. A) -O2C-CO2-Â oxalato (ox) B) S2O32-Â thiosulfato C) CH3NH2 ammino D) SCN- bonded to S thiocyanato-S- E) NCS-Â bonded to N thiocyanato-N- 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-OHÂ B) H-SH C) CH3-SH D) CH3-S-S-CH3 E) SO42- 23) Which one of the following could be a chelating ligand? A) NH3 B) CH3-CH2-NH2 C) NH2-CH2-CH2-NH2 D) any metal ion E) CN- 24) Which of the following is a bidentate ligand? A) H2O B) NO2- C) NH3 D) H2NCH2CH2NH2 E) [(O2C)2NCH2CH2N(CO2)2]4- 25) Which of the following ligand names is INCORRECT? A) F-/fluoro B) OH-/hydroxo C) NH3/ammino D) NO2-/nitrito E) SO42-/sulfato 26) Which of the following ligands cannot act as a chelating agent? A) nitrite ion B) ethylenediamine C) ethylenediaminetetracetate ion D) hydrazine E) oxalate ion 27) 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. 28) 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 29) 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. 30) 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.

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