Question

Which of the following is the strongest reducing agent? A) Fe2+(aq) B) Fe3+(aq) C) Cd(s) D) F-(aq) E) Na(s) . Which of the following is the weakest oxidizing agent? A) Cu+(s) B) Fe2+(aq) C) Sn4+(aq) D) K+(s) E) Cr3+ (aq) Which of the following is the weakest reducing agent? A) Al(s) B) K(s) C) Ba2+(aq) D) A13+ (aq) E) F-(aq) Determine which of the following pairs of reactants will result in a spontaneous reaction at 25°C. A) Pb2+ (aq) + Au(s) B) Na+(aq) + Al(s) C) Fe3+ (aq) + Al(s) D) Ag+(aq) + Br (aq) E) None of the above pairs will react.

Answer 1

1) Which is strongest redicing agent

E) Na(s)

Standard reduction potential of Na⁺ to Na ( -2.71V) is lower than other species , so it act as strogest reducing agent.

2) Which is weakest oxidizing agent

D) K⁺ (s)

standard reduction potential of K to K⁺ (-2.831V) , so reducing ability of K⁺ to K is lower than other species , so K⁺ act as weakest oxidizing agent

3) Which is weakest reducing agent

C) Ba²⁺(aq)

Ba²⁺ is already completely oxidised , so it will not further oxidise

4) Which pair give spontaneous reaction at 25℃

D) Ag⁺(aq) + Br^-(aq)

Note : actually , C and D both pairs gives spontaneous reaction at 25℃ but if single choice is the answer then D is the answer.