SOLVED

91) Which is the most plausible and consistent combination of hybrid orbital notation and magnetic/geometric description of [CoF6]3-? A) sp2d/diamagnetic/square planar B) sp2d/paramagnetic/square planar C) sp3d2/diamagnetic/octahedral D) sp3d2/paramagnetic/octahedral E) sp2d/paramagnetic/tetrahedral 92) [Cu(H2O)4]2+ absorbs light in the yellow part of the visible spectrum, thereby appearing to have the color ________. A) blue B) cyan C) green D) purple E) yellow 93) [CuCl4]2- absorbs light in the blue part of the visible spectrum, thereby appearing to have the color ________. A) blue B) cyan C) green D) purple E) yellow 94) Of the following complex ions: [CrCl(NH3)5]2+, [Cr(NH3)6]3+, [CrCl(H2O)5]2+, [Cr(H2O)6]3+, one appears pink, one yellow, one blue-green and one violet. Which is blue-green? A) [Cr(NH3)6]3+ B) [CrCl(NH3)5]2+ C) [CrCl(H2O)5]2+ D) [Cr(H2O)6]3+ E) both [CrCl(H2O)5]2+ and [CrCl(NH3)5]2+ 95) Of the following complex ions: [CoCl(NH3)5]2+, [Co(NH3)6]3+, [Co(en)3]3+, [Co(H2O)6]3+, one appears pink, two are yellow, and one blue. Which is blue? A) [Co(NH3)6]3+ B) [CoCl(NH3)5]2+ C) [Co(H2O)6]3+ D) [Co(en)3]3+ E) both [Co(en)3]3+ and [Co(H2O)6]3+ 96) As ethylenediamine is added to a solution of [Ni(H2O)6]2+, the water molecules are replaced two at a time by ethylenediamine to produce the sequence of ions: [Ni(H2O)6]2+, [Ni(en)(H2O)4]2+, [Ni(en)2(H2O)2]2+, and [Ni(en)3]2+. How does the color change through the sequence? A) The color changes toward red with the addition of ethylenediamine. B) The color changes toward purple with the addition of ethylenediamine. C) Red, yellow, purple, blue with the addition of ethylenediamine. D) There is no color change with the addition of ethylenediamine. E) The color change cannot be predicted with the addition of ethylenediamine. 97) The net formation constant for tetrachloromercurate(II) ion is 1.2 × 1015. Calculate the approximate standard electrode potential for: [HgCl4]2-(aq) + 2 e- → Hg(l) + 4 Cl-(aq) Given: Hg2+(aq) + 2 e- → Hg(l)E° + 0.85 V A) -0.39 V B) -0.63 V C) +0.70 V D) +0.41 V E) zero 98) Why is an aqueous solution of Fe3+ acidic? A) Iron ions attract hydroxide ions from water leaving hydrogen ions. B) Iron ions react with water to produce hydrogen ions. C) Iron ions attract water molecules to form a complex. D) Iron ions form a complex with water then lose hydrogen ions from its water ligands. E) Iron ions force the dissociation of water. 99) If it is assumed that [Fe(H2O)6]3+ can lose two hydrogens, what is the formula of the resulting ion when Fe3+ is placed in water? A) [Fe(H2O)2](OH)2]2- B) [Fe(OH)(H2O)5]2+ C) [Fe(OH)2(H2O)4]2+ D) [Fe(OH)2(H2O)4]+ E) [Fe(OH)2(H2O)4]2- 100) Chlorophyll is a green pigment involved in the growth of plants. One type of chlorophyll is a complex. What color of light should plants grow best in? A) blue B) cyan C) green D) magenta