4. The strong acid HA is added to water. Which of the following is the strongest base in the system?
(A) HA
(B) H₂O
(C)
(D)
(E)

5. The acids HC2H3O2 and HF are both weak, but HF is a stronger acid than HC2H3O2. HCI is a strong acid. Order the following according to base strength. (A) (B) (C) (D) (E) none of these

6. The two salts AgX and AgY have very similar solubilities in water. The salt AgX is much more soluble in acid than is AgY. What can be said about the relative strengths of the acids HX and HY? (A) nothing can be said about their relative strengths (B) HY is stronger than HX (C) HX is stronger than HY (D) the acids have equal strengths (E) none of these

7. For the combustion of ethyl alcohol as described in the above equation, which of the following statements is(are) true? C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(Λ), ΔΗ = −1.37 x 103 kJ I: The reaction is exothermic； II: The enthalpy change would be different if gaseous water were produced； III: The reaction is not an oxidation-reduction one； IV: The products of the reaction occupy a larger volume than the reactants. (A) I, II (B) I, II, III (C) I, III, IV (D) III, IV (E) I only

8. Compounds containing bismuth in the +5 oxidation state tend to be _ and compounds containing bismuth in the +3 oxidation state tend to be _ (A) ionic, ionic (B) ionic, molecular (C) molecular, molecular (D) molecular, ionic (E) none of these

9. One mole of an ideal gas at 25 ℃ is expanded isothermally from 5.0 L to 10.0 L under such conditions that no work is produced in the surroundings. Which statement is correct? (A) = 0 (B) = RIn2/298 (C) = 0 (D) = 0 (E) =

10. Which of the following is true? (A) as long as the disorder of the surroundings is increasing, a process will be spontaneous (B) for any process, have opposite signs (C) , the process is at equilibrium (D) ΔΗ° is zero for a chemical reaction at constant temperature (E) none of these

11. At constant pressure, the reaction, 2NO2(g) → N2O4(g) is exothermic. The reaction is (A) always spontaneous (B) spontaneous at low temperatures but not at high temperatures (C) spontaneous at high temperatures but not at low temperatures (D) never spontaneous (E) none of these

12. For a reaction in a voltaic cell, both ∆H° and ∆S° are positive. Which of the following statements is true? (A) E°cell will increase with an increase in temperature (B) E°cell will decrease with an increase in temperature (C) E° cell will not change when the temperature increases (D) ∆G° ＞ 0 for all temperatures (E) none of the above statements is true.

13. Which of the following statements is(are) true? I: An excited atom can return to its ground state by absorbing electromagnetic radiation； II: The energy of an atom is increased when electromagnetic radiation is emitted from it； III: The energy of electromagnetic radiation increases as its frequency increases； IV: An electron in the n = 4 state in the hydrogen atom can go to the n = 2 state by emitting electromagnetic radiation at the appropriate frequency； V: The frequency and wavelength of electromagnetic radiation are inversely proportional to each other. (A) II, III, IV (B) III, V (C) I, II, III (D) III, IV, V (E) I, II, IV

14. What is the electron configuration for the chromium atom? (A) [Ar] 4s23d4 (B) [Ar] 4s13d5 (C) [Kr] 4s13d5 (D) [Kr] 4s²3d4 (E) none of these

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