6. Which of the following statements is false a. The rate of vaporization increa
ID: 693771 • Letter: 6
Question
6. Which of the following statements is false a. The rate of vaporization increases with increasing surface area. b. The rate of vaporization increases with decreasing s strength of intermolecular forces. c. The rate of vaporization increases with increasing temperature. d. Molecules with hydrogen bonding are more volatile than compounds with dipole-dipole forces. e. None of the above is false. 7. On a phase diagram, the yaporization curve is between a. a solid and a gas. b. a solid and a liquid. e. a liquid and a gas. d. two solids. e. two liquids 8. Identify the characteristics of a body-centered cubic cell. h, 80% packing efficiency a. edge length-2 b. edge length-2r, 52% packing efficiency c, edge length = 4r-G, 68% packing efficiency d-edge length-2,6, 74% packing efficiency e, edge length-2r, 60% packing efficiency 9. Identify the technique that determines the arrangement of atoms and measures the distance between them. a. x-ray diffraction b. ultraviolet c. nuclear magnetic resonance d. infrared e. atomic absorption 10. Identify the type of solid for diamond. a. metallic atomic solid b. ionic solid c. nonbonding atomic solid d. molecular solid e. networking atomic solid 11. Give the coordination number for a face-centered cubic cell. a. 2 b. 8 c. 12 d. 10 e. 6Explanation / Answer
6. Option -'d' is false; because molecule with hydrogen bonding is less volatile than compounds with dipole- dipole forces.
7. On a phase diagram the vapoursation curve lie between liquid and gas.
Hence option - c is correct
8. Option- c is correct
Packing efficiency = 68% and edge length = 4r/3
9. X-ray diffraction method is used to determine the arrangement of atoms and distance between them.
Hence option- a is correct.
10. Diamond is a networking atomic solid, because each carbon atom is tetrahedrally attached to 4 different carbon atoms forming a network
Hence , option- e is correct.
11. In face centred cubic unit cell each atom is attached to 6 atoms in its plane and 3 above and 3 below it, hence the coordination number of FCC is 12.
Option -c is correct.
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