49. Choose the element that is the strongest reducing agent in the gas phasc.
(A) Li
(B) Na
(C) K
(D) Rb
(E) Cs

1. For the reaction 2H2(g) + O2(g)⇌2H2O(g), what is the relationship between K and Kp at temperature T? (A)(B) (C)(D)(E)

2. For a particular system at a particular temperature, there are _______ equilibrium constant(s) and _______ equilibrium position(s). (A) an infinite number of, one (B) one, an infinite number of (C) one, one (D) an infinite number of, an infinite number of (E) none of these

3. Force per impact versus the molar mass of the ideal gas. Which graph represents the plot? (A) (B) (C) (D) (E) none of these

4. Which of the following statements is true concerning ideal gases? (A) the temperature of the gas sample is directly related to the average velocity of the gas particles (B) at STP, 1.0 L of Ar(g) contains about twice the number of atoms as 1.0 L of Ne(8) because the molar mass of Ar is about twice that of Ne (C) a gas exerts pressure as a result of the collisions of the gas molecules with the walls of the container (D) the gas particles in a sample exert attraction on one another (E) all of these statements are false

5. When the equation ； (basic solution) is balanced using the smallest whole- number coefficients, what is the coefficient of ? (A)1(B) 2 (C) 3 (D) 4 (E) 6

6. For the reaction of sodium bromide with chlorine gas to form sodium chloride and bromine, what are the appropriate half-reactions? (ox = oxidation and re = reduction) (A) (B) (C) (D)(E)

7. A solution contains the ions . Dilute solutions of NaCl, , and Na2S are available to separate the positive ions from each other. In order to effect separation, the solutions should be added in which order? (A) Na2SO4, NaCl, Na2S(B) Na2SO4, Na2S, NaCl (C) Na2S, NaCl, Na2SO4 (D) NaCl, Na2S, Na2SO4 (E) NaCl, Na2SO4, Na2S

8. The sodium salt, NaA, of a weak acid is dissolved in water； no other substance is added. Which of these statements (to a close approximation) is true? (A)(B) (C) (D) (E) none of these

9. Consider two separate solutions of equal concentration. The first solution contains sodium hydroxide, and the second solution contains barum hydroxide. Which solution has the lower pH? (A) the sodium hydroxide solution (B) the barium hydroxide solution (C) the pH's of the two solutions are equal (D) we need to know the concentrations to answer this questio (E) we need to know the volumes to answer this question

10. Identify the strongest basc. (A)(B) CH3OH (C)(D) H2O (E)

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