Electrochemistry questions
1808 published questions with worked solutions.
- During electrolysis, the species discharged at the cathode are
- Amount of electricity that can deposit 108 g of silver from AgNO_3 solution is
- Standard potentials at 25^ : Zn^ 2+ +2e^- Zn , E^ =-0.762 V; Mg^ 2+ +2e^- Mg , E^ =-2.37 V. When zinc dust is added to a solution...
- The emf of a cell in terms of the reduction potentials of its left and right electrodes is
- By how much is the oxidizing power of the Cr_2O_7^ 2- /Cr^ 3+ couple decreased if the H^+ concentration is decreased from 1 M to...
- The emf of the cell Mg ,| ,Mg^ 2+ (0.01 M) ,|| ,Sn^ 2+ (0.1 M) ,| ,Sn at 298 K is (given E^ _ Mg^ 2+ /Mg =-2.34 V, E^ _ Sn^ 2+...
- Given E^ _ Fe^ 3+ /Fe^ 2+ =+0.77 V and E^ _ Sn^ 2+ /Sn =-0.14 V, the standard emf for the reaction Sn (s)+2 Fe^ 3+ (aq) 2 Fe^ 2+...
- In the electrochemical cell H_2 (g,1 atm ) ,| , H^+ (1 M) ,|| , Cu^ 2+ (1 M) ,| , Cu (s), which one of the following statements...
- An I_2 (s) ,| , I^- (0.1 M) half-cell is connected to a H^+ (aq) ,| , H_2 (1 bar ) ,| , Pt half-cell, and the emf is found to be...
- If the G of the cell reaction AgCl +e^- Ag + Cl^- is -21.20 kJ, the standard emf of the cell is
- The reduction potentials of four elements P, Q, R, S are -2.90, +0.34, +1.20 and -0.76 V respectively. Reactivity decreases in...
- Using the following data, calculate G^ (in kJ) for the reaction 5 Ce^ 4+ (aq)+ Mn^ 2+ (aq)+4 H_2O (l) 5 Ce^ 3+ (aq)+ MnO_4^-...
- When a lead-acid cell is charged, then
- The Edison storage cell is represented as Fe (s)+ FeO (s) ,| , KOH (aq) ,| , Ni_2O_3 (s) ,| , Ni (s), with half-reactions Ni_2O_3...
- The emf of a galvanic cell, with electrode potentials of silver =+0.80 V and copper =+0.34 V, is
- The standard emf for the cell reaction Zn + Cu^ 2+ Cu + Zn^ 2+ is 1.10 V at 25^ . The emf for the cell reaction, when 0.1 M Cu^...
- The standard electrode potential of the normal hydrogen electrode (NHE) at 298 K is
- Given: Zn^ 2+ +2e^- Zn (s), E^ =-0.76 V; Fe^ 3+ +e^- Fe^ 2+ , E^ =-0.77 V; Cr^ 3+ +3e^- Cr , E^ =-0.79 V; H^+ +e^- 12 H_2 , E^...
- Four alkali metals A, B, C and D have standard electrode (reduction) potentials of -3.05, -1.66, -0.40 and +0.80 V respectively....
- The standard electrode potentials of Zn^ 2+ /Zn and Ag^+/Ag are -0.763 V and +0.799 V respectively. The standard potential of the...
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