15. A hearing aid increases the sound intensity level by 20 decibels (dB). By what factor does this increase the actual sound intensity?
(A) 800
(B) 400
(C) 200
(D) 100
(E) 2

16. Which reagent can reduce 2-butanone to n-butane? (A) NaBH4 (B) LiAlH4 (C) PCC (D) Zn(Hg), HCl (E) KMnO4

17. The ground state term symbol for the neutral oxygen atom (O) is relevant to discussions of reactive oxygen species or atomic oxygen in biochemical contexts. What is the ground state term symbol for O? (A) 1S (B) 1P (C) 1D (D) 3P (E) 3D

18. Which statement about the Hartree-Fock (HF) method is correct? (A) The HF method gives the exact electronic energy because it includes full electron correlation. (B) The HF method approximates the many-electron wavefunction as a single Slater determinant, enforcing antisymmetry. (C) The HF method treats electron-electron repulsion only as a constant and ignores exchange effects. (D) In the HF method, the orbitals are fixed and never optimized; only the total energy is minimized. (E) The HF method is a semi-empirical method because it requires experimental parameters.

19. In a gravimetric determination of nickel using dimethylglyoxime (DMG), a student performed three replicate trials. In each trial, the student weighed the nickel-DMG precipitate before it had reached a constant mass (i.e., the precipitate was still slightly damp with residual solvent). Which of the following statements best describes this error? (A) It is a random error that can be minimized by increasing the number of replicate measurements. (B) It is a systematic error that results in a positive bias, leading to a consistently higher calculated nickel content. (C) It is an indeterminate error that primarily affects the precision of the data set rather than its accuracy. (D) It is a systematic error that results in a negative bias, leading to a consistently lower calculated nickel content. (E) It is a random error caused by the inherent fluctuations in the ambient humidity of the laboratory.

20. Consider the reaction: Using the steady-state approximation for the intermediate I, which expression for the rate of product formation is correct? (A) (B)(C)(D) (E)

21. In instrumental analysis, the internal standard method is often preferred over external calibration when sample loss or injection variability is expected. Which of the following statements regarding the properties and selection of an internal standard is correct? (A) The internal standard should be a substance that is already present in the original sample matrix to ensure compatibility. (B) The primary purpose of an internal standard is to compensate for matrix effects that suppress or enhance the analyte's signal. (C) An ideal internal standard should have a chemical structure and physical properties similar to the analyte, but its signal must be well-resolved from the analyte's signal. (D) Adding a higher concentration of the internal standard will directly increase the sensitivity (slope) of the calibration curve for the analyte. (E) If the instrument's sensitivity drops by 20% during a run, the internal standard method will fail because the response factor is no longer constant.

22. In clinical biochemistry and medical imaging, the color of metal-containing species used in diagnostics (e.g., contrast agents, blood analytes) often arises from d-d transitions or charge-transfer (CT) transitions. Which of the following species has a color that is not primarily due to charge-transfer? (A) Mn2+(aq) (B) KMnO4 (C) [Cu(NH3)4]2+ (D) Fe3O4 (E) KFeFe(CN)6

23. In human blood, the bicarbonate buffer system is the primary mechanism for maintaining physiological pH (≈7.40). Which of the following changes would most strongly drive the equilibrium below to the right, increasing blood acidity?  CO2 + H2O ⇌ H2CO3 ⇌ H+ + HCO3- (A) Hyperventilation (rapid breathing) (B) Hypoventilation (slow or shallow breathing) (C) Increased renal excretion of H+ (D) Intravenous administration of bicarbonate (E) Decreased CO2 concentration in blood

24. Assume a (hypothetical) planet where the temperature is so high, so the ground state of an electron in the hydrogen atom is n = 4. What is the ratio of the hydrogen IE on this planet to that on earth? (A) 1:16 (B) 1:4 (C) 4:1 (D) 16:1 (E) 1:1

25. In analytical spectroscopy, different regions of the electromagnetic spectrum interact with matter by inducing specific quantum transitions. Which of the following pairs correctly matches the spectral region with its corresponding quantum transition and reflects the correct energy relationship? (A) X-ray: transitions of valence electrons; higher energy than UV radiation. (B) Ultraviolet-Visible (UV-Vis): transitions of inner-shell electrons; lower energy than Infrared radiation. (C) Infrared (IR): changes in the configuration of nuclear spins; used for functional group identification. (D) Microwave: transitions between rotational energy levels of molecules; longer wavelength than Infrared radiation. (E) Radio wave: vibrational transitions within a molecule; used in Nuclear Magnetic Resonance (NMR) spectroscopy.

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