26. Choose the correct statement about the diagram below.

(A) The diagram is qualitativelycorrect for water.
(B) The diagram shows that the melting point of the solid increases withincreasing pressure.
(C) The diagram shows the triple point above 1 atm pressure.
(D) The diagram could represent the phase diagram of CO2.
(E) None of the above statements is correct.

27. For each of the following pairs of substances, select the one expected to have thelower melting point: I. H2O, H2S II. HCl, NaCl III. CH4, C3H8(A) H2O, HCl, C3H8 (B) H2O, NaCl, C3H8 (C) H2O, HCl, CH4(D) H2S, HCl, CH4 (E) H2S, NaCl, CH4

28. Which of the following intermolecular forces exist in all solid substances?(A) Dispersion forces (B) Dipole-dipole forces (C) Covalent bonding(D) Hydrogen bonding (E) Ion-induced dipole forces

29. A solution of hydrogen peroxide is 23.6% H2O2 by mass and has a density of 1.11g/cm3. The molarity of the solution is:(A) 7.23 M (B) 0.262 M (C) 7.70 M (D) 8.03 M (E) none of these

30. How many of the following help determine whether or not a solution forms?I. the polarities of the solute and solventII. the densities of the solute and solventIII. the probability of the mixed state (of the solution)IV.the energies needed for the solution formation to occurV. the state of matter of the solute (solid, liquid, gas)(A) 1 (B) 2 (C) 3 (D) 4 (E) 5

31. Two liquids form a solution and release a quantity of heat. How does the pressureabove the solution compare to that predicted by Raoult's law?(A) It will be greater. (B) It will be less. (C) It will be the same.(D) It will show positive deviation. (E) None of these.

32. The observed van't Hoff factor for an electrolyte is less than the expected factorbecause of _________.(A) electrolytic repulsion (B) complete dissociation (C) coagulation(D) ion pairing (E) gelation

33. Ethylenediamine (en) is a bidentate ligand. What is the coordination number ofcobalt in [Co(en)2Cl2]Cl?(A) 4 (B) 5 (C) 6 (D) 7 (E) 8

34. Which of the following complexes shows geometrical isomerism?(A) [Cu(NH3)4]Cl2 (B) [Co(NH3)6]Cl3 (C) [Co(NH3)5Cl]Cl2(D) K[Co(NH3)2Cl4] (E) none of these

35. The complex ions of Zn2+ are all colorless. The most likely explanation for this is:(A) Zn2+ is paramagnetic.(B) Zn2+ exhibits “d orbital” splittings in its complexes such that they absorb allwavelengths in the visible region.(C) Since Zn2+ is a d10 ion, it does not absorb visible light even though the “dorbital” splittings are correct for absorbing visible wavelengths.(D) Zn2+ is not a transition metal ion.(E) None of these is correct.

36. What is the sum of all isomers (geometrical and optical) that the complex ionCo(en)2Cl2+ exhibits?(A) 0 (B) 1 (C) 2 (D) 3 (E) 4

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