6. Consider the diprotic acid H2A with K₁ = 1.00 × and K₂ =1.00 × . Find the pH of HA in0.100 M NaHA.
(A) 5.00
(B) 6.00
(C) 7.00
(D) 8.00
(E) 9.00

7. How many milliliters of 0.202 M NaOH should be added to 25.0 mL of 0.023 3 M salicylic acid (2- hydroxybenzoic acid) to adjust the pH to 3.50? [salicylic acid (H2A, pK1 = 2.972, pK2 = 13.7)] (A) 1.023 (B) 2.223 (C) 3.323 (D) 4.023 (E) 5.223

8. A solution containing the complex formed between Bi(III) and thiourea has a molar absorptivity of9.32 × 103 L at 470 nm. What is the absorbance of a 3.79 X M solution of the complex at 470 nm in a 1.00 cm cell? (A) 1.353 (B) 2.021 (C) 0.335 (D) 0.353 (E) 0.153

9. What kind of interferences may cause the complex spectra in atomic mass spectrometry? (A) Isobaric Interferences (B) Polyatomic Ion Interferences (C) Oxide and Hydroxide Species' Interference (D) none of the above (E) all of the above

10. A chromatography column with a length of 10.3 cm and an inner diameter of 4.61 mm is packed with a stationary phase that occupies 61.0% of the volume. If the volume flow rate is 1.13 mL/min, find the linear flow rate in cm/min. (A) 17.4 (B) 12.8 (C) 10.1 (D) 8.32 (E) 4.91

11. If the reaction 2HBr → H2 + Br2 belongs to second-order reaction, which of the following will yield a linear plot? (A). In[HBr] vs time. (B). [HBr] vs time. (C). 1/[HBr] vs time. (D). 1/ln[HBr] vs time. (E). 1/[HBr]² vs time.

複選題12. Which of the following phenomena or effect can be attributed to the quantum nature of light? (A). Blackbody radiation. (B). Photoelectric effect. (C). Laser. (D). Carrots look red. (E). All of these.

13. A particle with mass m is moving freely in one dimension along x with zero potential energy. From the viewpoint of quantum mechanics, which following statement is wrong? (A). The time-independent Schrodinger equation is - = Εψ. (B). ψ(x) = can be the wavefunction for the particle with single linear momentum +kħ. (C). ψ(x) = cos(kx) is one of solutions of its time-independent Schrodinger equation. (D). The total energy of the particle is quantized. (Ε). For (x) = cos(kx), its expectation value of the operator is equal to zero.

14. A particle is confined in a one-dimensional box with a finite length. The potential energies inside and outside the box are equal to zero and infinity, respectively. From the viewpoint of quantum mechanics, which of the following statement is wrong? (A). The degeneracy of each energy level is one. (B). The zero-point energy is equal to zero. (C). The wavefunction with a higher total energy has a larger number of nodes. (D). Outside the box, the value of the wavefunction is equal to zero. (E). The total energy is inversely proportional to the square of the length of the box. (- h2 d22m dx2 +kx²) = Eψ, where x is

15. The Schrodinger equation of a harmonic oscillator is= Εψ,where x is displacement from the equilibrium position, m is mass and k is force constant. Which following statement is wrong? (A). The vibrational frequency is proportional to . (B). The zero-point energy is not equal to zero. (C). The total energy is linearly proportional to vibrational frequency. (D). The expectation value of x, ＜x＞, is equal to zero. (E). The degeneracy of each energy level is two.

16. For the ground state of helium atom, which following statement is wrong? (A). The total angular momentum of two electrons is zero. (B). A helium atom in the ground state is diamagnetic. (C). The term symbol is ¹S0. (D). Two electrons in helium are distinguishable. (E). The shielding effect of two 1s electrons to 2s orbital is smaller than that to 2p orbital.

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