29.Who characterized alpha, beta and gamma radiation?
(A)Thomson
(B)Einstein
(C)Rutherford
(D)Heisenberg
(E)Bohr

25. Suppose the hypothetical set of quantum numbers:n = 1, 2, 3, ……l = 0, 1, 2, 3, …… , n–1mₗ = 1s = 1/2, –1/2then which of the following statements is not correct?(A) There is one s orbital, one p orbital, and one d orbital.(B) The atomic number of the first element in the d orbital-filler is 12.(C) There are two transition elements in the first period.(D) The atomic number of the first inert gas is 2.(E) If one element has the atomic number 14, then its electron configuration is 1s²2s²2p³3s²3p².

26.Arrange in decreasing order of stability of the following four isomers. (I)cis-1-chloro-2-methylcyclohexane (II)trans-1-chloro-2-methylcyclohexane (III)cis-1-chloro-3-methylcyclohexane (IV)trans-1-chloro-3-methylcyclohexane (A)(II) > (III) > (I) > (IV) (B)(I) > (II) > (IV) > (III) (C)(III) > (II) > (IV) > (I) (D)(IV) > (II) > (I) > (III) (E)none of the above.

27.Diastereomers have the same (A)melting point. (B)reaction rate toward optically active reagent. (C)molecular weight. (D)stereochemistry at each chiral center. (E)specific rotation.

28.Which of the following statements is correct? (A)A structure with two chiral centers will always give rise to four stereoisomers (B)Molecules that contain chiral carbons must be optically active compounds. (C)Equimolar mixtures of two enantiomers are called racemate. (D)Distereomers have same physical properties. (E)none of the above.

30.Of the following sets of four quantum numbers, identify the ones that can exist for an electron in an atom? (A)(5, 4, 5, +1/2) (B)(2, 2, -1, +1/2) (C)(3, 2, 2, +1/2) (D)(6, 7, 0, +1/2) (E)(2, 0, -2, +1/2)

31.How many constitutional isomers are there for C5H11Br? (A)3 (B)7 (C)8 (D)10 (E)11.

32.Which of the following statements correctly describes an achiral molecule? (A)The molecule has a nonsuperimposable mirror image. (B)The molecule exhibits optical activity when it interacts with plane-polarized light. (C)The molecule has an enantiomer. (D)The molecule might be a meso form. (E)None of the above.

33.Which of the following molecules has the highest bond order? (A)BN (B)CO (C)NO (D)Ne2 (E)F2

34.According to the VSEPR theory, which of the following statements is correct? (A) The expected geometry of TeO32- is trigonal planar. (B) The expected geometry of SbBr 4 3- is tetrahedral. (C) The expected geometry of SeS24- is bent. (D) The expected geometry of BiCl3 is pyramidal. (E) The expected geometry of SnI42- is square planar.

複選題35.Which of the following statements is correct? (A)In O2, O22- , O2- , and O2+ species, only the O22- molecule is diamagnetic. (B)The stability decreases in the order O2+ > O2 > O2 - >O2 2- (C)The dissociation energy of N2 is larger than that of N2 + , while the dissociation energy of C2+ is smaller than that of C2. (D)In Mn2+, Cr3+, Hg2+ , V 3+, Ni2+, and La3+ six transition metal ions, only Mn2+ , V 3+, and La3+ are paramagnetic. (E)The atom size increases in the order K+ > Cl- > S2- , while the atom size of Au+ is larger than that of Au3+ .