15. If $n = 2$, how many orbitals are possible?
(A) 3
(B) 4
(C) 2
(D) 8
(E) 6

16. Which of the following bonds is least polar? (A) $\text{C—O}$ (B) $\text{H—C}$ (C) $\text{S—Cl}$ (D) $\text{Br—Br}$ (E) They are all nonpolar.

17. Which of these is an isoelectronic series? (A) $\text{Na}^+$, $\text{K}^+$, $\text{Rb}^+$, $\text{Cs}^+$ (B) $\text{K}^+$, $\text{Ca}^{2+}$, $\text{Ar}$, $\text{S}^{2-}$ (C) $\text{Na}^+$, $\text{Mg}^{2+}$, $\text{S}^{2-}$, $\text{Cl}^-$ (D) $\text{Li}$, $\text{Be}$, $\text{B}$, $\text{C}$ (E) None of these (A-D)

18. How many of the following molecules possess dipole moments? $\text{BH}_3$, $\text{CH}_4$, $\text{PCl}_5$, $\text{H}_2\text{O}$, $\text{HF}$, $\text{H}_2$ (A) 1 (B) 2 (C) 3 (D) 4 (E) 5

19. Which of the following molecules (or ions) are nonlinear? $$\text{NO}_2^-,\quad\text{C}_2\text{H}_2,\quad\text{N}_3^-,\quad\text{HCN},\quad\text{CO}_2,\quad\text{H}_2\text{O}_2$$ (A) $\text{C}_2\text{H}_2,\ \text{HCN}$ (B) $\text{CO}_2,\ \text{N}_3^-$ (C) $\text{NO}_2^-,\ \text{H}_2\text{O}_2$ (D) $\text{N}_3^-,\ \text{NO}_2^-$ (E) all are linear

20. The bond angles about the carbon atom in the formaldehyde molecule, $\text{H}_2\text{C}=\text{O}$ , are about: (A) $120^\circ$ (B) $60^\circ$ (C) $109^\circ$ (D) $180^\circ$ (E) $90^\circ$

21. The hybridization of the central atom in $\text{O}_3$ is: (A) $sp$ (B) $sp^2$ (C) $sp^3$ (D) $dsp^3$ (E) $d^2sp^3$

22. Which of the following does not contain at least one pi bond? (A) $\text{H}_2\text{CO}$ (B) $\text{CO}_2$ (C) $\text{C}_2\text{H}_2$ (D) $\text{C}_3\text{H}_8$ (E) All of the above (A-D) contain at least one pi bond

23. In a 0.1 molar solution of NaCl in water, which one of the following will be closest to 0.1? (A) The mole fraction of NaCl. (B) The mass fraction of NaCl. (C) The mass percent of NaCl. (D) The molality of NaCl. (E) All of these are about 0.1.

24. Which of the following chemical or physical changes is an endothermic process? (A) the evaporation of water (B) the combustion of gasoline (C) the mixing of sulfuric acid and water (D) the freezing of water (E) none of these

25. Rank the following compounds according to increasing solubility in water. I. $\text{CH}_3-\text{CH}_2-\text{CH}_2-\text{CH}_3$ II. $\text{CH}_3-\text{CH}_2-\text{O}-\text{CH}_2-\text{CH}_3$ III. $\text{CH}_3-\text{CH}_2-\text{OH}$ IV. $\text{CH}_3-\text{OH}$ (A) $\text{I} < \text{III} < \text{IV} < \text{II}$ (B) $\text{I} < \text{II} < \text{IV} < \text{III}$ (C) $\text{III} < \text{IV} < \text{II} < \text{I}$ (D) $\text{I} < \text{II} < \text{III} < \text{IV}$ (E) None of these (A-D) is correct. # Periodic table 1. 18 | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | 1 H 1.008 | 2 | | | | | | | | | | | 13 | 14 | 15 | 16 | 17 | 2 He 4.0026 | 3 Li 6.94 | 4 Be 9.0122 | | | | | | | | | | | 5 B 10.81 | 6 C 12.011 | 7 N 14.007 | 8 O 15.999 | 9 F 18.998 | 10 Ne 20.180 | 11 Na 22.990 | 12 Mg 24.305 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 Al 26.982 | 14 Si 28.085 | 15 P 30.974 | 16 S 32.06 | 17 Cl 35.45 | 18 Ar 39.948 | 19 K 39.098 | 20 Ca 40.078 | 21 Sc 44.956 | 22 Ti 47.867 | 23 V 50.942 | 24 Cr 51.996 | 25 Mn 54.938 | 26 Fe 55.845 | 27 Co 58.933 | 28 Ni 58.693 | 29 Cu 63.546 | 30 Zn 65.38 | 31 Ga 69.723 | 32 Ge 72.630 | 33 As 74.922 | 34 Se 78.97 | 35 Br 79.904 | 36 Kr 83.798 | 37 Rb 85.468 | 38 Sr 87.62 | 39 Y 88.906 | 40 Zr 91.224 | 41 Nb 92.906 | 42 Mo 95.95 | 43 Tc (98) | 44 Ru 101.07 | 45 Rh 102.91 | 46 Pd 106.42 | 47 Ag 107.87 | 48 Cd 112.41 | 49 In 114.82 | 50 Sn 118.71 | 51 Sb 121.76 | 52 Te 127.60 | 53 I 126.90 | 54 Xe 131.29 | 55 Cs 132.91 | 56 Ba 137.33 | 57/71 * | 72 Hf 178.49 | 73 Ta 180.95 | 74 W 183.84 | 75 Re 186.21 | 76 Os 190.23 | 77 Ir 192.22 | 78 Pt 195.08 | 79 Au 196.97 | 80 Hg 200.59 | 81 Tl 204.38 | 82 Pb 207.2 | 83 Bi 208.98 | 84 Po (209) | 85 At (210) | 86 Rn (222) | 87 Fr (223) | 88 Ra (226) | 89-103 # | 104 Rf (265) | 105 Db (268) | 106 Sg (271) | 107 Bh (270) | 108 Hs (277) | 109 Mt (276) | 110 Ds (281) | 111 Rg (280) | 112 Cn (285) | 113 Nh (286) | 114 Fl (289) | 115 Mc (289) | 116 Lv (293) | 117 Ts (294) | 118 Og (294) * Lanthanide series | 57 La 138.91 | 58 Ce 140.12 | 59 Pr 140.91 | 60 Nd 144.24 | 61 Pm (145) | 62 Sm 150.36 | 63 Eu 151.96 | 64 Gd 157.25 | 65 Tb 158.93 | 66 Dy 162.50 | 67 Ho 164.93 | 68 Er 167.26 | 69 Tm 168.93 | 70 Yb 173.05 | 71 Lu 174.97 | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- # Actinide series | 89 Ac (227) | 90 Th 232.04 | 91 Pa 231.04 | 92 U 238.03 | 93 Np (237) | 94 Pu (244) | 95 Am (245) | 96 Cm (247) | 97 Bk (247) | 98 Cf (251) | 99 Es (252) | 100 Fm (257) | 101 Md (258) | 102 No (259) | 103 Lr (262) | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---

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