10. of the following compounds which has the 16. Which of these is the most comm

Question

10. of the following compounds which has the 16. Which of these is the most common naturally lowest melting point? occurring form in which silicon is found? A. SnCl, B. AgCI C. Cacl, D. CCI. E. HC A. Sulfide B. Fluoride C. Metallic element D. Oxide E. Nitride 11. The +1 oxidation state is more stable than the +3 oxidation state for which group 13 element? 17. Of the following compounds which is LEAST likely to behave as a Lewis acid? 12. The anhydride of Ba(OH), is A. BaH, B. Ba0H C. Ba D. Bao, E Bao 18. The strongest base in liquid ammonia is 13. The normal modes of a carbon dioxide molecule NH," C. NH,' A. NH, D. NM E, OH' that are infra-red active include which of these? I. Bending ll. Symmetric stretching IIl. Asymmetric stretching 19. Which of the following lists the hydrides of group 14 elements in order of thermal stability from lowest to highest? A. Ionly B. Il only -C. Ill only D. 1and Il only E- l, ll, and Ill 20. Which of the following is required for both 14. Which of the following is an n-type paramagnetism and ferromagnetism? semiconductor? A Strong oxidizing conditions 8. Low-spin electron configuration Silicon -B. Diamond -C. Silicon carbide D. Arsenic-doped silicon C Metallic physical properties D. Superexchange E. Unpaired electrons Gallium-doped silicon 21. The solid-state structures of the principal 15. Which of the following is lower allotropes of elemental boron are made up of which of the following structural units? for argon than for neon? A. B. C. D. E. Melting point Boiling point Polarizability Heat of vaporization First ionization energy B. C. D. E. B12 icosahedra B, cubes Bs octahedra 8 tetrahedra Chains of 8 atoms

Explanation / Answer

10) E) HCl

11) E) Tl

12) E) BaO

13) E) I,II and II

14) D) Arsenic dopped silicon

15) E) First ionization energy

16) D) Oxide

17) E) SCl2

18) B) NH2-

19) A)

20) E)

21) A)

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