4. Which of the following combination gives the greatest buffer capacity? (A) 0.05 M CH3COOH (B) 0.05 M CH3COONa (C) 0.01 M CH3COOH/CH3COONa (The mole ratio of CH3COOH/CH3COONa is 1.) (D) 0.05 M CH3COOH/CH3COONa (The mole ratio of CH3COOH/CH3COONa is 1.) (E) 0.05 M CH3COOH/CH3COONa (The mole ratio of CH3COOH/CH3COONa is 5.)

6. The following reactions are spontaneous and thus proceed to the right, as written: \( 2\text{H}^+ + \text{Cd}_{\text{(s)}} \rightleftharpoons \text{H}_2 + \text{Cd}^{2+} \) \( 2\text{Ag}^+ + \text{H}_{2\text{(g)}} \rightleftharpoons 2\text{Ag}_{\text{(s)}} + 2\text{H}^+ \) \( \text{Cd}^{2+} + \text{Zn}_{\text{(s)}} \rightleftharpoons \text{Cd}_{\text{(s)}} + \text{Zn}^{2+} \) What can we deduce regarding the strengths of H+ , Ag+ , Cd2+, and Zn2+ as oxidizing agents? (A)Ag+ > H+ > Cd2+ > Zn2+ (B) Cd2+ > Zn2+ > Ag+ > H+ (C) Zn2+ > Cd2+ > H+ > Ag+ (D) Zn2+ > Cd2+ > Ag+ > H+ (E) None of the above

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