16 What is the wt for the voltaic cell represented by the combination of the fol

Question

16 What is the wt for the voltaic cell represented by the combination of the following hatf reactions? Ag'(aq) + e. Ni'.(aq) + 2e Ag(s) Ni(s) E-0.80 V E-0.25 V ) 0.55 VB 0sV C) 135V D) 1.85 V 17. A voltaic cell prepared using chromium and cobalt has the following cell notation Cr(s) Cr (aq)| Co2 (aq) | Co(s) Which of the following reactions occurs at the cathode? A) Cr)Cr(ag) 3e B) Cr"(aq) +3e Cr(s) C) Co(s)-. Co'.(aq) + 2e- D) Co"(aq) + 2e. Co(s) 18 Examine the following half-reactions and select the strongest reducing agent among the substances E-0.14 V E"=-1.60 V A) Sn B) Sn C) T D) Ti l|H | IrO, | Ir is shown below 19 Data for the voltaic cell: Pb | Pb Pb2"(aq) + 2e- Pb(s) E- -0.35 V lots) + 4H'(aq) + 2 Pb(s) Ir(s) + 2H20() + Pb2-(aq) Eceo" 1.08 V Which of the following gives the correct standard reduction potential of the IrO I electrode and identifies its role in this voltaic cell? A) 0.73 V, anode B) 0.73 V, cathode C) 1.43 V, anode D) 1.43 V, cathode 20. A voltaic cell prepared using manganese and iodine has the following cell notation Which of the following equations correctly represents the balanced, spontaneous cell reaction? A) Nin:-(aq) + 2 Ce"(a) Mn(s) + 2 Ce."(al) B) Mn2-(aq) + 2 Ce..(al) Mn(s) + 2 Ce'.(al) C) Mn(s) + 2 Ce-(aq) Mn2+(aq) + 2 Ce"(a) D) Mn(s) + 2 Ce..(aq) Mn2.(aq) + 2 Ce-(a)

Explanation / Answer

Ni(s) ------------> Ni^2+ (aq) + 2e^-    E0 = 0.25v
2Ag^+ (aq) + 2e^- -----> 2Ag(s)          E0 =0.80v
-----------------------------------------------------
Ni(s) + 2Ag^+ (aq) --------> Ni^2+ (aq) + 2Ag(s) E0 cell = 1.05v
B. 1.05v
17. Co^2+ (aq) +2e^- -------> Co(s) at cathode reduction reaction is takes place
D.Co^2+ (aq) +2e^- -------> Co(s)
18. A. Sn^2+
19. B. 0.73v cathode
20. Mn(s) ----------------> Mn^2+ (aq) +2e^-
     2Ce^+4 (aq) + 2e^- -----> 2Ce^3+ (aq)
    --------------------------------------------
     Mn(s) + 2Ce^+4 (aq) -----------> Mn^2+ (aq) + 2Ce^3+(aq)
D.Mn(s) + 2Ce^+4 (aq) -----------> Mn^2+ (aq) + 2Ce^3+(aq)

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