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Unformatted text preview: Which of the following exists mainly as cations in compounds? A) P B) Ga C) As D) Si E) Ca All of the following form saline hydrides except A) barium. B) beryllium. C) lithium. D) magnesium. E) calcium. All of the following can act as Lewis acids except A) B2O3. B) SO3. 1 C) Na2O. D) NO2. E) CO2. When saline hydrides dissolve in water they A) produce O2(g). B) reduce water and produce H2(g). C) Saline hydrides are insoluble in water. D) reduce water and produce O3. E) produce H3O+(aq). Which of the following is NOT true? A) In diamond, each carbon atom is sp3-hybridized and linked to its four neighbors, with all electrons in C-C s-bonds. B) C60 is molecular and thus soluble in solvents like benzene. C) Silicon adopts the same structures and same types of elemental allotropes as for carbon. D) Graphite is an electrically conducting solid. E) Diamond is an excellent conductor of heat. What is the formula of baking soda? A) Na2CO310H2O B) NaHCO3 C) NaHSO4 D) Na2SO4 E) Na2CO3 Which of the following is a basic oxide? A) MgO(s) B) CO2(g) C) SO2(g) D) CO(g) E) SiO2(s) All of the following reactions involve carbon monoxide acting as a reducing agent except A) Ni(s) + 4CO(g) Ni(CO)4(g). B) PbO(s) + CO(g) Pb(s) + CO2(g). C) 2CO(g) + O2(g) 2CO2(g). D) CO(g) + H2O(g) CO2(g) + H2(g). The mineral spondumene contains long, straight chain silicates involving the SiO32unit. What is the shape of SiO32-? A) T-shaped B) tetrahedral C) trigonal planar D) trigonal pyramidal E) see-saw Which of the following is NOT true about silicon carbide? A) It is an hard material, used as an abrasive. B) It belongs to the class of covalent carbides. C) It is also called carborundum. D) It is prepared by the reaction between SiO2 and carbon. E) It adopts a structure similar to graphite. All of the following contain silicates in various forms except A) asbestos. B) mica. C) talc. D) molecular sieves. E) alum. Which of the following compounds does not exist? A) NCl3 B) PCl5 C) PCl3 D) NCl5 E) SCl2 Which of the following is diamagnetic? A) O22B) NO2 C) O2 D) O2E) OH The stable forms of chlorine, bromine, and iodine at 25C and 1 atm are A) Cl2(g), Br2(g), and I2(g). B) Cl2(g), Br2(l), and I2(s). C) Cl2(g), Br2(l), and I2(l). D) Cl2(g), Br(l), and I(s). E) Cl2(g), Br(l), and I2(g). Select the weakest acid from the following list. A) HIO. B) HBrO3. C) HClO3. D) HIO4. E) HClO4. Why does Li melt at a higher temperature than Na? What oxides tend to be basic, acidic and amphoteric? (general trends not specific) Which bond is Sn-O bond is strongest? Which is more acidic? SnO 2 or SnO 4 ...
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- Spring '08