Coordination ChemistryD–1
SECTION D: COORDINATION CHEMISTRY
INDEX: D001LEVEL: (U)ANSWER: (D)KEYWORDS: formulas and equations
ALTERNATIVE FORMAT: (SA)
Write the formula for the coordination compound ammonium tetrathiocyanatodiamine chromate(III). / Which is the formula for the coordination compound ammonium tetrathiocyanatodiamine chromate(III)?
(A)[NH4(CNS)4(NH3)2JCrO4
(B)[(NH4)2(CNS)4(NH3)2JCrO4
(C)NH3[Cr(CNS)4(NH4)2]
(D)NH4[Cr(CNS)4(NH3)2]
INDEX: D002LEVEL: (U)ANSWER: (C)
KEYWORDS: formulas and equations
ALTERNATIVE FORMAT: (SA)
Omit responses. / The systematic name most descriptive of the compound V(OH)2Cl2 is
(A)vanadic dihydroxydichloride.
(B)vanadous basic chloride.
(C)vanadium(IV) dihydroxydichloride.
(D)vanadium(IV) dichloride dihydrate.
INDEX: D003LEVEL: (U)ANSWER: (B)
KEYWORDS: formulas and equations
ALTERNATIVE FORMAT: (SA)
What name is most consistent with systematic (IUPAC) nomenclature for the compound Cu(NH3)4Cl2? / Which name is most consistent with systematic (IUPAC) nomenclature for the compound Cu(NH3)4Cl2?
(A)copper ammonia chloride
(B)tetraamminecopper(II) chloride
(C)copper tetraammonium chloride
(D)copper(II) ammonium chloride
INDEX: D004LEVEL: (U)ANSWER: (C)
KEYWORDS: formulas and equations
ALTERNATIVE FORMAT: (SA)
What name is most consistent with systematic (IUPAC) nomenclature for the compound K3Fe(CN)6? / Which name is most consistent with systematic (IUPAC) nomenclature for the compound K3Fe(CN)6?
(A)potassium ferricyanide
(B)potassium ferrocyanide
(C)potassium hexacyanoferrate(III)
(D)potassium iron(III) hexacyanate
INDEX: D005LEVEL: (U)ANSWER: (B)
KEYWORDS: formulas and equations
ALTERNATIVE FORMAT: (SA)
Write the formula for the triaquadibromomonochloroferrate(II) ion. / The formula for triaquadibromomonochloroferrate(II) ion is
(A)[Fe(H2O)3Br2Cl]2–(C)[Fe(H2O)3Br2Cl]+
(B)[Fe(H2O)3Br2Cl]–(D)[Fe(H2O)3Br2Cl]
INDEX: D006LEVEL: (U)ANSWER: (B)
KEYWORDS: formulas and equations
ALTERNATIVE FORMAT: (SA)
Write the formula for tetramminecopper(II) sulfate. / Which formula corresponds to tetramminecopper(II) sulfate?
(A)[Cu(NH3)]SO4(D)[Cu2(NH2)2]SO4
(B)[Cu(NH3)4]SO4(E)[Cu2(NH3)4]SO4
(C)[Cu(NH3)5]SO4
INDEX: D007LEVEL: (A)ANSWER: (D)
KEYWORDS: molecular geometry
ALTERNATIVE FORMAT: (TF)
can have both cis– isomers and trans– isomers. Use each response in a separate question. / Which complex ion could have cis–trans isomers?
(A)square planar [PtBrCl3]2–
(B)octahedral [Fe(CN)6]3–
(C)tetrahedral [ZnBrCl3]2–
(D)octahedral [CrBr2(NH3)4] +
INDEX: D008LEVEL: (A)ANSWER: (C)
KEYWORDS: molecular geometry
ALTERNATIVE FORMAT: (FR)
Sketch the optical isomers of [Co(NH3)2(H2O)2Cl2]+. /
Identify the optical isomer of this complex ion.
(A)(C)
(B)(D)
INDEX: D009LEVEL: (U)ANSWER: (B)
KEYWORDS: molecular geometry
ALTERNATIVE FORMAT: (SA)
Omit responses. / What geometry does [CoF6]3– exhibit?
(A)tetrahedral(C) square planar
(B)octahedral(D) trigonal bipyramidal
INDEX: D010LEVEL: (U)ANSWER: (B)
KEYWORDS: molecular geometry
ALTERNATIVE FORMAT: (SA)
Omit responses. / The number of cis–trans isomers possible for [Pt(NH3)2ClBr] is
(A)0(B)2(C)3(D)4
INDEX: D011LEVEL: (U)ANSWER: (C)
KEYWORDS: formulas and equations
ALTERNATIVE FORMAT: (FR)
What is the best representation of the predominant silver containing species present in an aqueous solution of ammonia? / The best representation of the predominant silver containing species present in an aqueous solution of ammonia is
(A)AgNO3(aq)(C)[Ag(NH3)2]+(aq)
(B)AgNH2(aq)(D)[Ag(NH3)6]2+(aq)
INDEX: D012LEVEL: (U)ANSWER: (D)
KEYWORDS: laboratory
ALTERNATIVE FORMAT: (SA)
Omit responses. / What is the color of the complex formed when aqueous Fe3+ reacts with SCN–?
(A)blue(C)colorless
(B)green(D)blood red
INDEX: D013LEVEL: (G)ANSWER: (C)
KEYWORDS: laboratory
ALTERNATIVE FORMAT: (SA)
What is the visible product of mixing equal volumes of dilute solutions of CuSO4 and NH3? / Which pair of compounds form a visible product on mixing equal volumes of their dilute solutions?
(A)NaNO3 and CuSO4(C)CuSO4 and NH3
(B)NH4Cl and CuCl2(D)NH3 and CaCl2
INDEX: D014LEVEL: (A)ANSWER: (C)
KEYWORDS: laboratory
ALTERNATIVE FORMAT: (SA)
Omit responses. / If a large excess of aqueous ammonia is added to an aqueous solution of silver nitrate, the most predominant silver-containing species will be
(A)Ag+(aq)(C)[Ag(NH3)2]+
(B)AgNO3(D)[Ag(NH4)2]+
INDEX: D015LEVEL: (A)ANSWER: (D)
KEYWORDS: laboratory, molecular geometry
ALTERNATIVE FORMAT: (SA)
Omit responses. / A compound has the empirical formula CoCl3·4NH3. One mole of the compound yields one mole of silver chloride when treated with silver nitrate. Ammonia is not removed by treatment with concentrated sulfuric acid. The formula for the compound is best represented by
(A)Co(NH3)4Cl3
(B)[Co(NH3)Cl2]Cl
(C)[Co(NH3)3Cl3]NH3
(D)[Co(NH3)4Cl2]Cl
INDEX: D016LEVEL: (A)ANSWER: (D)
KEYWORDS: laboratory, molecular geometry
ALTERNATIVE FORMAT: (SA)
Omit responses. / A compound has the empirical formula CoCl3·5NH3. One mole of the compound yields 2 mol 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)CoCl3·5NH3(D)[Co(NH3)5Cl]Cl2
(B)[Co(NH3)5]Cl3(E)[Co(NH3)4Cl2]Cl·NH3
(C)[Co(NH3)4Cl]Cl2·NH3
INDEX: D017LEVEL: (A)ANSWER: (D)
KEYWORDS: laboratory
ALTERNATIVE FORMAT: (FR)
Ag2CO3 is insoluble in water. What can be added to a mixture of silver carbonate and water that would cause the silver salt to dissolve? / At 30 °C, the solubility of Ag2CO3 would be greatest in one liter of
Solubility Product Constant, Ksp
Ag2CO38 10–12
(A)0.05 M Na2CO3(D)0.05 M NH3
(B)0.05 M AgNO3(E)0.10 M K2CO3
(C)pure water
INDEX: D018LEVEL: (A)ANSWER: (E)
KEYWORDS: laboratory, acids and bases
ALTERNATIVE FORMAT: (FR)
Why does a solution of chromic nitrate give an acid reaction? / A solution of chromic nitrate gives an acid reaction because
(A)nitrate ions are acid in water.
(B)nitrate ions act as a strong oxidizing agent.
(C)nitrate ions react with water to form the strong acid, nitric acid.
(D)molecules of chromic nitrate react with water to form nitric acid, which is a strong acid, and insoluble chromic hydroxide.
(E)the hydrated chromic ion tends to lose a proton from one of the water molecules complexed with it.
INDEX: D019LEVEL: (U)ANSWER: (D)
KEYWORDS: laboratory
ALTERNATIVE FORMAT: (FR)
Why does silver chloride dissolve in ammonia solution? / Silver chloride is soluble in ammonia solution because of
(A)the high dielectric constant of ammonia.
(B)the fact that silver chloride is the salt of a strong acid.
(C)the basic properties of ammonia.
(D)the formation of a complex ion.
(E)the small solubility product of silver chloride.
INDEX: D020LEVEL: (U)ANSWER: (D)
KEYWORDS: laboratory
ALTERNATIVE FORMAT: (TF)
The ions , , and all form complex ions with ammonia. Use each response in a separate question. / Which series contains ions that all form complex ions with ammonia?
(A)Hg2+, Pb2+, Al3+
(B)Ag+, Hg2+, Pb2+
(C)Al3+, Cr3+, Fe3+
(D)Cu2+, Zn2+, Ag+
(E)Cu2+, Zn2+, Al3+
INDEX: D021LEVEL: (U)ANSWER: (B)
KEYWORDS:
ALTERNATIVE FORMAT: (SA)
Omit responses. / The number of ions formed by the dissociation of one molecule of Ag(NH3)2Cl is
(A)1(B)2(C)3(D)4
INDEX: D022LEVEL: (A)ANSWER: (D)
KEYWORDS: atomic structure, bonding
ALTERNATIVE FORMAT: (SA)
How many unpaired electrons are there in . Use each response in a separate question. / Which complex ion has the largest number of unpaired electrons?
(A)Cu(NH3)42+(D)Fe(H2O)63+
(B)Cr(NH3)63+(E)CoCl42–
(C)Mn(CN)64–
INDEX: D023LEVEL: (A)ANSWER: (C)
KEYWORDS: bonding, molecular geometry
ALTERNATIVE FORMAT: (SA)
Omit responses. / The complex ion formed by the reaction of NH3 with Co3+ ion has an octahedral structure. Therefore, on the basis of valence bond theory, the hybrid orbitals on Co3+ are
(A)ds(B)dsp2(C)d2sp3(D)sp2
(E)sp3
(SA) = short answer; (FR) = free response; (TF) = true/false(U) = understanding; (A) = analysis; (G) = generalization