40. A compound of which transition metal is responsible for the white color of most paper?
(A) titanium
(B) copper
(C) chromium
(D) nickel
(E) zinc

41. Which of the following are structural isomers? I: coordination isomers； II: linkage； III: geometric isomers； IV: optical isomers (A) I, III (B) II, IV (C) I, III, IV (D) II, III (E) I, II

42. How many unpaired electrons are found in Mn(CN)63-?(A) 0 (B) 1 (C) 2 (D) 4 (E) 5

43. The complex ions of are all colorless. The most likely explanation for this is that(A) is paramagnetic (B) exhibits "d orbital" splittings in its complexes such that they absorb allwavelengths in the visible region (C) because is a d10 ion, it does not absorb visible light even though the "dorbital" splittings are correct for absorbing visible wavelengths (D) is not a transition metal ion (E) none ofthese explanations could be correct.

44. A student gave a molecule the following name: 3-methyl-4-isopropylpentaneHowever, the teacher pointed out that although the molecule could be correctly drawn from this name, the nameviolates the IUPAC rules. What is the correct (IUPAC) name for the molecule?(A) 4-isopropyl-3-methylpentane (B) 2-isopropyl-3-methylpentane (C) 1,1,2,3-tetramethylpentane (D)2,3,4-trimethylhexane (E) 3,4-dimethylheptane

45. H2CCHCH2N(CH3)2 is(A) an alkyne and a secondary amine (B) an alkene and a primary amine (C) an alkene and a tertiary amine (D)an alkyne and a tertiary amine (E) none of these

46. Which of the following often have useful solvent properties?(A) esters only (B) alcohols only (C) amines only (D) ketones only (E) all of these have useful solvent properties

47. Oxidation of 2-methyl-1-butanol could yieldI: 2-methyl-1-butanone； II: 2-methylbutanal； III: 2-methylbutanoic acid(A) I only (B) II only (C) III only (D) II and III (E) I and III

48. Which statement is true?.(A) protein synthesis takes place in the cytoplasm of the cell (B) each gene in the DNA molecule codes for aspecific protein (C) messenger RNA can be found in both the nucleus and the cytoplasm of each cell (D) when apeptide bond is formed, H2O is produced. (E) all of these statements are true.

49. Teflon is an example of a(A) copolymer (B) homopolymer (C) dimer (D) two of these (E) none of these

50. A protein is(A) polysaccharide (B) a saturated ester of glycerol (C) one of the units composing a nucleic acid (D) a polymerof amino acid units (E) an aromatic hydrocarbon with a fused ring structure

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