Q&A Hero

Q: Which of the metal ions in the following complex ions has a d5electron configuration?A) V(H2O)62+B) RhCl64-C) Co(CN)4-D) Fe(CN)63-E) Mo(NH3)63+

Q: According to valence bond theory, what hybrid orbitals are occupied by the ligands in the complex [Mn(H2O)6]2+? A) dsp3 B) sp3 C) d2sp3 D) sp2 E) dsp2

Q: Which of the following high-spin complexes has the most unpaired electrons? A) [Ti(H2O)6]2+ B) [V(H2O)6]3+ C) [Fe(H2O)6]3+ D) [Cr(H2O)6]3+ E) [Sc(H2O)]63+

Q: Which of the following best describes the complex [Mn(H2O)6]2+? A) sp3hybridization; diamagnetic B) d2sp3hybridization; diamagnetic C) d2sp3hybridization; paramagnetic D) dsp3hybridization; diamagnetic E) sp3hybridization; paramagnetic

Q: What bond hybridization is associated with octahedral complexes? A) d2sp3 B) sp3 C) sp D) dsp3 E) dsp2

Q: Which of the following compounds can exhibit optical activity? A) [Co(NH3)4Cl2]Cl B) [Co(NH2CH2CH2NH2)3]Cl3 C) Na2[CoCl4] D) [Co(NH3)6]Cl3 E) Cr(CO)6

Q: How many optical isomers do the cisand transisomers of [Co(en)2Br2]+have? A) cis, 1 and trans, 1 B) cis, 2 and trans, 0 C) cis, 0 and trans, 0 D) cis, 0 and trans, 2 E) cis, 2 and trans, 2

Q: Which of the following complexes can exhibit optical isomerism? (en=H2NCH2CH2NH2 and is bidentate)A) Co(NH3)3Cl3B) cis-Co(en)2Cl2C) trans-Co(en)2Br2D) cis-Co(NH3)4Cl2E) none of these

Q: Molecules that have nonsuperimposable mirror images are A) multidentate. B) racemic. C) dextrorotatory. D) chiral. E) levorotatory.

Q: Which complex is capable of forming geometric isomers? A) K3[FeCl6] B) [Co(NH3)5Br]Br2 C) [Co(NH3)6]Br3 D) [Pd(NH3)2Br2] E) [Pt(NH3)4]Br2

Q: What is the total number of geometric isomers possible for the octahedral complex [Co(NH3)3(H2O)3]? A) 1 B) 4 C) 5 D) 2 E) 3

Q: How many geometric isomers are possible for the square planar complex [Pt(NH3)2BrCl]? A) 2 B) 4 C) 5 D) 1 E) 3

Q: The complexes [Ni(NH3)5Cl]Br and [Ni(NH3)5Br]Cl are what type of isomers? A) geometric isomers B) constitutional isomers C) stereoisomers D) linkage isomers E) optical isomers

Q: Which of the following are constitutional isomers? I. coordination isomers II. linkage isomers III. geometric isomers IV. optical isomers A) I, III, and IV B) II and III C) I and II D) I and III only E) II and IV only

Q: What is the formula for the pentaamminehydroxovanadium(II) ion?A) [V(NH3)5(OH)5]2+B) [V(NH3)5(OH)5]3-C) [V(NH3)5(OH)]2+D) [V(NH3)5(OH)]+E) [V(NH3)(OH)5]3-

Q: What is the formula for the hexaaquacobalt(II) ion?A) [Co(H2O)6]2+B) [Co(H2O)4]2+C) [Co2(H2O)6]4-D) [Co2(H2O)6]2+E) [Co2(H2O)6]4+

Q: What is the correct formula for sodium tetrachlorocuprate(II)? A) Na3[CuCl4] B) Na2[CuCl4] C) Na[CuCl4] D) Na4[CuCl4] E) Na2[CuCl6]

Q: What is the correct IUPAC name for [AuCl4(H2O)2]-?A) diaquatetrachloroaurate(I) ionB) diaquatetrachloroaurate(III) ionC) diaquatetrachloroaurate(0) ionD) diaquatetrachlorogold(III) ionE) diaquatetrachlorogold(I) ion

Q: Which of the following Lewis bases may not serve as a bidentate ligand?A) C2O42-B) NH2CH2CH2NH2C) HOCH2CH2NH2D) HOCH2CH2OHE) CH3NH2

Q: Ag+forms many complexes with a coordination number of 2. Some of these are [Ag(NH3)2]+, [Ag(CN)2]-, and [Ag(S2O3)2]3-. Which of the following statements is true?A) The hybridization of Ag+is sp2.B) In these complexes, Ag+is a Lewis base.C) In these complexes, the ligands are monodentate.D) The hybridization of Ag+is dsp.E) The Ag+complexes are good reducing agents.

Q: Which of the following species is least likely to function as a ligand in a transition-metal coordination compound?A) NH3B) CO32-C) H2OD) BF3E) Cl"

Q: The freezing point of an aqueous 0.050 m solution of a platinum(IV) complex having the molecular formula Pt(NH3)3Cl4 is -0.19ºC. Which of the following equations best represents what happens when Pt(NH3)3Cl4 dissociates in water? (Kf for water is 1.86ºC/m.)A) Pt(NH3)3Cl4(s) →[Pt(NH3)3Cl2]2+(aq) + 2Cl-(aq)B) Pt(NH3)3Cl4(s) →[Pt(NH3)3Cl3]+(aq) + Cl-(aq)C) Pt(NH3)3Cl4(s) →[Pt(NH3)3Cl]3+(aq) + 3Cl-(aq)D) Pt(NH3)3Cl4(s) →[Pt(NH3)2Cl2]2+(aq) + 2Cl-(aq) + NH3(aq)E) Pt(NH3)3Cl4(s) →Pt4+(aq) + 4Cl-(aq) + 3NH3(aq)

Q: In complexes of platinum(IV), the coordination number is usually A) 3. B) 4. C) 6. D) 2. E) 1.

Q: What is the coordination number of cobalt in [Co(en)2Cl2]Cl? en = A) 6 B) 3 C) 4 D) 5 E) 7

Q: What is the coordination number of iron in K3[Fe(ox)3]? ox = A) 6 B) 3 C) 4 D) 5 E) 2

Q: In which of the following ions does the metal ion have a 3d7 electron configuration?A) [NiCl4]2-B) [Mn(H2O)6]2+C) [CoCl4]2-D) [Co(NH3)5Cl]2+E) [Co(NH3)4Cl2]+

Q: The bond between a metal cation and a ligand is best classified as a(n) A) polar covalent bond. B) ionic bond. C) nonpolar covalent bond. D) polydentate bond. E) coordinate covalent bond.

Q: Which of the following is a necessary characteristic of a ligand?A) A ligand must be an anion.B) A ligand must be an ion.C) A ligand must be a Lewis base.D) A ligand must be bidentate.E) A ligand must be a Lewis acid.

Q: What is the oxidation state of iron in K4[Fe(CN)6]? A) 3 B) 2 C) 4 D) 4 E) 

Q: The formula for a platinum(IV) complex is [Pt(NH3)2Br2]Cl2. In aqueous solution, it will dissociate into A) 5 ions. B) 4 ions. C) 6 ions. D) 2 ions. E) 3 ions.

Q: Which of the following coordination compounds will immediately form a precipitate when combined with an AgNO3solution? A) K[Cr(NH3)2Cl4] B) K3[Cr(CN)6] C) [Cr(NH3)6]Cl3 D) [Cr(NH3)2(H2O)Cl3] E) [Cr(NH3)3Cl3]

Q: In which of these pairs of elements can both elements normally exhibit multiple oxidation states?A) K and OB) Cs and ClC) Mg and SeD) Co and CuE) Sc and Al

Q: Common ores of copper may contain which of the following forms of copper? 1) The free metal or native copper (Cu(s)) 2) Cu2O(s) and CuO(s) 3) CuS(s) A) 1 only B) 2 only C) 3 only D) 1 and 2 E) 1, 2, and 3

Q: Copper metal can be oxidized by which of the following acids? A) H3PO4 B) HI C) H2SO4 D) CH3COOH E) HBr

Q: Which of the following is a product of the acidification of sodium chromate? A) CrO42-(aq) B) Cr2O72-(aq) C) Cr3+(aq) D) CrO3(s) E) Cr(s)

Q: What is the principal ore of chromium? A) chromite B) chromate C) chrome alum D) stibnite E) hematite

Q: Which of the following is a dark green solid? A) CrO3 B) KCr(SO4)212H2O C) Na2Cr2O7 D) Na2CrO4 E) Cr2O3

Q: Which of the following statements about transition metals is/are correct? 1) The sixth period elements have higher ionization energies than the fourth and fifth period element in their respective groups. 2) The total number of oxidation states observed for a fourth period element is greatest for manganese (group VIIB). 3) Covalent radii uniformly decrease from left to right across each period. A) 1 only B) 2 only C) 3 only D) 1 and 2 E) 1, 2, and 3

Q: The oxidation number of which of the following elements is often +2 but can be as great as+7? A) manganese B) cobalt C) aluminum D) bismuth E) chromium

Q: In which compound is cobalt in the highest oxidation state? A) Co2(CO)8 B) [Co(NH3)6]Cl2 C) [Co(NH3)4Cl2]Cl D) Na2[CoCl4] E) K4[CoF6]

Q: All of the following elements have the oxidation states listed except A) Ti, +3. B) Zn, +3. C) V, +3. D) Co, +3. E) Fe, +3.

Q: A property that many representative nonmetals and many transition elements share is that they both have A) color in many compounds. B) many paramagnetic compounds. C) high electronegativities. D) many compounds that observe the octet rule. E) many oxidation states.

Q: In which of the following compounds is the metal atom not in a common oxidation state?A) CrOCl2B) NiF2C) CuID) Zn(NO3)2E) MnSO4

Q: What is the maximum oxidation number for chromium? A) 7 B) 4 C) 6 D) 5 E) 8

Q: What is the maximum oxidation state for niobium, Nb? A) 4 B) 3 C) 2 D) 6 E) 5

Q: What is the maximum oxidation state for rhenium, Re? A) 6 B) 3 C) 2 D) 7 E) 4

Q: Which of the following first-row transition elements is not able to have a +3 oxidation state?A) ScB) CrC) VD) ZnE) Fe

Q: What is the maximum oxidation state expected for chromium? A) +6 B) +3 C) +4 D) +7 E) +5

Q: Which of the following statements is incorrect concerning the 3d, 4d, and 5d transition series?A) There is a large increase in radius in going from the 3d to the 4d metals.B) There is a general increase in size going left to right across each series due to an increasing number of electrons.C) Hafnium through mercury exhibit what is referred to as the lanthanide contraction.D) The separation of hafnium and zirconium found together in nature is difficult due to their similar chemistries, which are attributed to their virtually identical sizes.E) The transition metal from a period 6 group is similar in size to the peroid 5 transition metal sitting above it on the periodic table.

Q: The phenomenon called __________ contraction is responsible for the great similarity in atomic size and chemistry of 4d and 5d elements. A) coordination B) isomeric C) lanthanide D) transition E) none of these

Q: What is the principal source of commercial helium? A) Certain natural gas wells. B) Fractional distillation of air. C) It is a byproduct of commercial fusion research. D) It is a byproduct of commercial fission reactors. E) The mineral cleveite, a uranium ore.

Q: Which of the following noble gases has, thus far, eluded formation of a compound? A) xenon B) radon C) krypton D) neon E) argon

Q: Which of the noble gases is not obtained commercially by distillation of liquid air?A) kryptonB) neonC) heliumD) argonE) xenon

Q: Which of the noble gases was detected in the spectrum of the sun before it was ever isolated on earth? A) neon B) krypton C) xenon D) argon E) helium

Q: What is the acid anhydride of perchloric acid? A) Cl2O B) Cl2O3 C) Cl2O7 D) Cl2O5 E) ClO2

Q: In hot, basic solution, the hypochlorite ion is unstable. What are the products of its decomposition?A) HCl(aq) and Cl2(g)B) ClO3-(aq) and ClO4-(aq)C) Cl-(aq) and Cl2(g)D) ClO2-(aq) and ClO3-(aq)E) Cl-(aq) and ClO3-(g)

Q: Which of the following reactions is a disproportionation?A) CaSiO3(s) + 8HCl(aq) →H2SiCl6(aq) + CaCl2(aq) + 3H2O(l)B) Cl2(aq) + 2I-(aq) →I2(aq) + 2Cl-(aq)C) HCl(aq) + NaOH(aq) →NaCl(aq) + H2O(l)D) AgNO3(aq) + NaCl(aq) →AgCl(s) + NaNO3(aq)E) Cl2(g) + 2NaOH(aq) →NaClO(aq) + NaCl(aq) + H2O(l)

Q: Which of the following statements concerning chlorine and its compounds is false? A) At high temperatures, perchloric acid decomposes explosively. B) Chlorine is a weaker oxidizing agent than either bromine or iodine. C) Common bleach is a solution of sodium hypochlorite. D) Hydrogen chloride gas is commercially prepared by heating sodium chloride with concentrated sulfuric acid. E) In aqueous solution, chlorine disproportionates in basic solution to form chloride and hypochlorite.

Q: Most HCl(g) is obtained commercially A) by reaction of MnO2with concentrated HCl. B) by reaction of NaCl with concentrated H2SO4. C) by electrolysis of NaCl. D) by distillation of HCl(aq). E) as a by-product from the chlorination of hydrocarbons.

Q: Which of the following ions are oxidized by chlorine gas in an aqueous solution?A) F- onlyB) Br- onlyC) I- onlyD) Br- and I-E) I-, Br-, and F-

Q: Which of the following statements concerning elemental chlorine is incorrect?A) Cl2 is used to purify water.B) Cl2 is used in the preparation of polyvinyl chloride.C) Cl2 is used in the production of bleaching agents.D) Cl2 is used for the preparation of NaCl.E) Cl2 is used in the preparation of Br2.

Q: Which molecule does not have a bent molecular geometry? A) H2O B) SO2 C) N2O D) O3 E) H2S

Q: Which of the following is not a commercial use for sulfur dioxide?A) in the preparation of sulfuric acidB) as a disinfectantC) as a bleaching agent for wood pulpD) in a fire extinguisherE) as a food preservative

Q: In which of the following compounds does sulfur exist in the +4 oxidation state? A) KHSO3 B) Na2S4O6 C) Na2S2O3 D) K2SO4 E) H2S2O8

Q: Which of the following statements about sulfur is incorrect? A) The complete combustion of sulfur produces sulfur trioxide as the major product. B) In the Frasch process, underground deposits of sulfur are melted and forced to the surface under pressure. C) In the first step of the contact process, sulfur trioxide is produced from sulfur dioxide and oxygen using a vanadium catalyst. D) Sulfur dioxide produced from the combustion of fossil fuels has been implicated in respiratory ailments. E) In the Claus process, free sulfur is obtained by the partial burning of hydrogen sulfide.

Q: The process by which free sulfur is obtained by the partial burning of hydrogen sulfide is called A) the Frasch process. B) the Dow process. C) the Claus process. D) the Ostwald process. E) the contact process.

Q: The process of using superheated water to melt underground deposits of sulfur and force them to the surface is called A) the Claus process. B) the Frasch process. C) the Dow process. D) the steam-reforming process. E) the contact process.

Q: Which of the following statements concerning sulfur is incorrect? A) Sulfur exists in different allotropic forms. B) Sulfur is readily soluble in water. C) Sulfur has common oxidation states of "2, 0, +4, and +6. D) Sulfur may act as either an oxidizing agent or a reducing agent. E) Sulfur may exist as S8molecules.

Q: Which of the following is not an allotropic form of sulfur?A) S10B) S6C) S2D) S4E) S8

Q: A superoxide ion can be distinguished from the peroxide ion and the oxide ion because A) the superoxide ion is stable. B) the superoxide ion is paramagnetic. C) the superoxide ion is diamagnetic. D) the superoxide ion is an acid. E) the superoxide ion is a base.

Q: Which of the following compounds is a peroxide? A) Al2O3 B) Na2O2 C) BaO D) SiO2 E) Na2O

Q: Which of the following elements is least likely to form a stable oxide? A) Fe B) Ca C) S8 D) P4 E) He

Q: Which of the following compounds would not be expected to react with oxygen?A) NH3B) N2H4C) N2O5D) N2O4E) Li3N

Q: Suppose a metal (M) that is capable of forming +1, +2, and +3 oxidation states is heated and reacted with excess dioxygen gas. What is the mostlikely result? A) The metal will be oxidized to the +1 oxidation state and form a superoxide compound having the formula MO2. B) The metal will be oxidized to the +1 oxidation state and form a peroxide compound having the formula M2O2. C) The metal will be oxidized to the +2 oxidation state and form a compound having the formula MO. D) The metal will be oxidized to the +1 oxidation state and form a compound having the formula M2O. E) The metal will be oxidized to the +3 oxidation state and form a compound having the formula M2O3.

Q: What is the largest source for the commercial preparation of oxygen? A) peroxides B) air C) silicates D) water E) carbonates

Q: Which of the following is the acid anhydride of orthophosphoric acid? A) P4O10 B) PO4 C) P4 (white phosphorus) D) P4O6 E) P (red phosphorus)

Q: Polyphosphoric and metaphosphoric acids are made by a series of _____ reactions of orthophosphoric acid. A) condensation B) oxidation C) reduction D) combustion E) precipitation

Q: Which formula"name combination is incorrect? A) H3PO4, orthophosphoric acid B) H5P3O10, pentaphosphoric acid C) H3P3O9, trimetaphosphoric acid D) P4O10, tetraphosphorus decoxide E) H4P2O7, diphosphoric acid

Q: When P4O10reacts with water, the product is A) HPO3. B) H4P2O7. C) H3PO2. D) H3PO3. E) H3PO4.

Q: A primary industrial purpose of calcium phosphate is A) use as a fungicide. B) direct use as a plant growth supplement. C) use for treatment with sulfuric acid to make fertilizers. D) use as a starting material for PVC plastics. E) use to make phosphorus-containing vitamin pills.