27.Which one has a different relationship between the signal and concentration?
(A) Scattering
(B) Fluorescence
(C) Phosphorescence
(D) Absorption
(E) Emission

23. Among the following, which radical is the most stable?(A) I (B) II (C)III (D)IV (E)V

24. Place the following in order of decreasing magnitude of lattice energy.NaF MgO CsI AIN (A) CsI ＞ AIN ＞ MgO ＞ NaF (B) AIN ＞ MgO ＞ NaF ＞ CsI (C) NaF ＞ CsI ＞ MgO ＞ AIN (D) AIN ＞ MgO ＞ CsI ＞ NaF (E) CsI ＞ NaF ＞ MgO ＞ AIN

25. The method detection limit is (A) The lowest concentration of the calibration curve (B) The minimal detectable signal intensity of an analyte (C) The lowest detectable concentration of an analyte (D) The minimal measurable concentration of an analyte (E) The minimum concentration of an analyte that can be reliably distinguished from the blank

26. What is the rate law for the given reaction and its mechanism? (A) Rate = k[HgCl2][C2O42-] (B) Rate = k[HgCl2]2[C2O42-] (C) Rate = k[Hg2Cl2] (D) Rate = k[HgCl2][C2O42-]2 (E) Rate = k[HgCl2]2[C2O42-]2

28.A 50.0-mL aliquot of 1.0 M NaBrO (HBrO: pXa = 8.70) is titrated with 1.0 M HCl. What is the pH after adding 25.0 mL of the acid? (A) 11.30 (B) 9.30 (C) 8.70 (D) 5.30 (E) 3.30

29.Which option below outlines an effective method for relocating the position of a π bond? (A) Substitution, followed by addition (B) Addition, followed by substitution (C) Elimination, followed by addition (D) Addition, followed by elimination (E) None of the above

30. The nitrosonium ion, NO+, forms numerous fascinating complexes with nickel, cobalt, and iron. Based on molecular orbital theory, which of the following statements accurately describes NO+? (A) The nitrosonium ion, NO+, possesses a bond order of 2 and exhibits paramagnetism (B) The nitrosonium ion, NO+, possesses a bond order of 2 and exhibits diamagnetism (C) The nitrosonium ion, NO+, possesses a bond order of 3 and exhibits paramagnetism (D) The nitrosonium ion, NO+, possesses a bond order of 3 and exhibits diamagnetism (E) None of these choices are correct

31. At pH 8.0, the predominant form of ethylenediaminetetraacetic acid (EDTA; H4Y: K1= 1.02 x 10-2, K2 = 2.14 x 10-3, K3 = 6.92 x 10-7, K4 = 5.50 x 10-11) is (A) H3Y- (B)H2Y2- (C) HY3- (D) Equal amounts of H2Y2- and HY3- (E)Y4-

32. For a reaction producing both kinetic and thermodynamic products, which of the followings are linked to the kinetic product? (I) It is formed faster. (II) It is the more stable product.(III) l) It involves the lower energy transition state.(IV) ) It is favored with cold reaction conditions. (A) Only I (B) Only I, III and IV (C) Only II (D) Only II, III and IV (E) Only III

33. How many lone pairs of electrons are in the Lewis structure of D-glucose (C6H12O6 = 180.16 g mol- 1)? (A) 4 (B)6 (C)8 (D)9 (E)12