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41) Which of the following ionic compounds should have the highest melting point? A) NaI B) MgO C) NaCl D) LiBr E) CaS 42) There are no types of crystalline solids that are held together by: A) dipole-dipole interactions B) ionic attractions C) hydrogen bonds D) covalent bonds E) pi bonds only 43) Which of the substances below would produce the hardest, most brittle crystals? A) SiC B) Xe C) Cu D) KNO3 E) H2O 44) Which combination of “type of solid” and specific example is INCORRECT? A) ionic/”table salt” B) metallic/copper wire C) molecular/”dry ice” D) network covalent/iodine E) network covalent/silicon carbide 45) A crystal and its melt readily conduct electricity. The crystal also has a luster and is easily deformed. Thus, it is: A) a covalent network crystal B) an ionic crystal C) a metallic crystal D) a molecular crystal E) a covalent crystal. 46) Find a FALSE statement about X-rays. A) diffracted by crystals B) radiation of wavelength approximating 1 Angstrom C) visible to the naked eye D) used to determine the structure of molecules E) produced using high-energy electrons 47) A compound of iron and sulfur crystallizes in a lattice pattern described as cubic closest packed sulfide ions, with iron ions in all octahedral sites. What is its empirical formula? A) FeS B) FeS2 C) Fe3S4 D) Fe2S E) Fe2S3 48) Three types of holes of the cubic closest packed structure are: A) Trigonal, tetrahedral and octahedral B) Tetrahedral, pyramidal and octahedral C) Tetrahedral, bipyramidal and octahedral D) Cubic,, tetrahedral, and octahedral E) Tetragonal, tetrahedral and octahedral 49) Coordination number is: A) The number of atoms per unit cell B) The number of atoms in the corners of the unit cell C) The number of atoms in contact with a given atom D) The number of atoms in the holes of closest packed structures E) The number of layers in close packed structures 50) An atom at the corner of cubic unit cell is shared among: A) six adjoining unit cells B) four adjoining unit cells C) eight adjoining unit cells D) ten adjoining unit cells E) twelve adjoining unit cells

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