25. As indicated by Lewis structures, which of the following would probably not exist as a stable molecule?
(A) C₃H₄;
(B) CH₃OH ;
(C) C₂H₂;
(D) CH₃O;
(E) CH₂O.

26. How many of the following compounds exhibit resonance? O3 SO2 NF3 CCl4 (A) 0 ; (B) 1 ; (C) 2 ; (D) 3 ; (E) 4

27. Which statement about N2 is false? (A) The oxidation state is +3 on one N and -3 on the other. ; (B) It is a gas at room temperature. ; (C) It has one sigma bond and two pi bonds between the two atoms. ; (D) It can combine with H2 to form NH3. ; (E) It has two pairs of nonbonding electrons.

28. Which of the following is paramagnetic? (A) (B) (C) O2 ; (D) N2. ; (E) At least two of these are paramagnetic.

29. For a reaction aA → products, [A]0 = 4.0 M, and the first three successive half-lives are 48, 96, and 192 min. The order of this reaction in A is (A) 0 ; (B) 1 ; (C) 2 ; (D) 3 ; (E) none of these.

30. The rate law for a reaction is found to be Rate = k[A]2[B]. Which of the following mechanisms gives this rate law? I. A+B ⇌ E (fast); E+ B → C + D (slow) II. A + B ⇌ E (fast); E+A→C+D (slow) III. A + A → E (slow); E+B→C+D (fast) (A) I only; (B) II only ; (C) III only ; (D) II and III. ; (E) I and III.

31. Which of the following is the correct order of boiling points for NaNO3, C2H5OH, C2H6, and Ne? (A) Ne ＜ C2H5OH ＜ C2H6 ＜NaNO3; (B) NaNO3 ＜ C2H5OH ＜ C2H6 ＜Ne ; (C) Ne ＜ C2H6 ＜NaNO3 ＜ C2H5OH; (D) Ne ＜ C2H6 ＜ C2H5OH ＜ NaNO3; (E) C2H6 ＜ Ne ＜ C2H5OH ＜ NaNO3.

32. The normal boiling point of liquid X is less than that of Y, which is less than that of Z. Which of the following is the correct order of increasing vapor pressure of the three liquids at STP? (A) X, Y, Z (B) Y, X, Z ; (C) X, Z, Y ; (D) Z, Y, X ; (E) Y, Z, X.

33. The triple point of CO2 is at 5.2 atm and -57°C. Under atmospheric conditions of P = 630 torr, T=23° C, solid CO2 will (A) sublime. ; (B) melt. ; (C) remain solid. ; (D) boil. ; (E) in equilibrium with liquid.

34. A liquid-liquid solution is called an ideal solution if I. it obeys PV=nRT.;  II. it obeys Raoult's law. III. solute-solute, solvent-solvent, and solute-solvent interactions are very similar. IV. solute-solute, solvent-solvent, and solute-solvent interactions are quite different. (A) I, II, III ; (B) I, II, IV ; (C) I, II ; (D) I, IV ; (E) II, III.

35. When a nonvolatile solute is added to a volatile solvent, the solution vapor pressure _____, the boiling point _____ , the freezing point _____ and the osmotic pressure across a semipermeable membrane _____. (A) decreases, increases, decreases, increases. ; (B) decreases, decreases, increases, decreases. ; (C) increases, decreases, increases, decreases. ; (D) increases, increases, decreases, increases. ; (E) decreases, increases, decreases, decreases.

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