SOLVED

71) Choose the INCORRECT statement. A) Zn, Cd, and Hg all have electron configurations of (n-1)d10ns2. B) Because in Zn, Cd, and Hg only s electrons are participating, metallic bonding is strong. C) The low melting and boiling points of Zn, Cd, and Hg are due to the metallic bonding. D) Galvanized iron is iron coated with zinc. E) Cadmium and mercury compounds are poisonous. 72) Choose the INCORRECT statement. A) Zinc is poisonous in trace amounts. B) ZnO, CdS and HgS are used as artist’s pigments. C) The band gap is the energy difference between the conduction band and the valence band. D) The color of Zn, Cd, and Hg compounds depends on the width of the band gap. E) One proposed mechanism of mercury poisoning is that mercury compounds react with sulfur in enzymes. 73) Consider two metals, metal M and metal N. The reaction M + N2+ → M2+ + N will proceed if: A) M is Zn and N2+ is Pb2+ B) M is Cu and N2+ is Fe2+ C) M is Sn and N2+ is Ca2+ D) M is Ni and N2+ is Mg2+ E) M is Fe and N2+ is Ca2+ 74) Choose the INCORRECT statement. A) The inner transition elements include the lanthanides. B) The lanthanides are sometimes called rare earth elements. C) The lanthanides feature the filling of the 5f orbitals. D) The lanthanides have very similar chemical properties. E) Lanthanides are difficult to separate from each other. 75) Choose the INCORRECT statement. A) The lanthanides often occur naturally as oxides. B) The most common oxidation state of lanthanides is +4. C) Most of the lanthanides are paramagnetic. D) Like the transition elements, aqueous solutions of the lanthanides are colored. E) Fractionated means to alter slightly the ratio of the concentration of one element to another. 76) Choose the INCORRECT statement. A) Among the methods to separate the lanthanides are fractional precipitation and solvent extraction. B) Because the properties of the lanthanides are so similar, separation must be done in a series of repetitive steps. C) Lanthanides are reactive metals, that is they liberate H2 from acids. D) The 4f electrons play a major role in chemical bonding. E) The pure lanthanide metals can be produced by electrolytic reduction from the +3 oxidation state. 77) Write the probable electron configuration for Ti2+. A) 3d2 B) 4s2 C) 4s13d5 D) 4s24d4 E) 5s2 78) List the following in order of increasing number of unpaired electrons: Fe, V, Sc, Mn A) Mn < Fe < V < Sc B) Sc < V < Fe < Mn C) Fe < V < Sc < Mn D) V < Sc < Mn < Fe E) Sc < Mn < Fe < V 79) In the group of elements Cr, Ni, Sn, Pt, Ti, the one which is a main group element is ________. A) Ni B) Sn C) Ti D) Pt E) Cr 80) List the following in order of increasing atomic radius: Ti, Cr, V, Ca A) V < Ti < Ca < Cr B) Ca < V < Cr < Ti C) Ca < Ti < Cr < V D) Cr < V < Ti < Ca E) Cr < V < Ca < Ti