Electrochemistry questions
1808 published questions with worked solutions.
- How many of the following will have negative standard electrode potentials? K, Na, Ag, Zn, Li, Cu, Hg
- For the electrochemical cell M|M^+||X|X^-, E^ _ M^+/M =0.44 V and E^ _ X/X^- =0.33 V. The E^ _ cell of the reaction M+X M^++X^- is
- Calculate the standard free energy change (in kilojoules) for the reaction 12 Cu (s)+ 12 Cl_2 (g) 12 Cu^ 2+ + Cl^- , taking place...
- How many of the following are the CORRECT expressions to calculate the e.m.f. of a cell? (1) E_ cell =E_ oxi ( anode )+E_ red (...
- Standard electrode potentials of Ag^+/Ag and Ni^ 2+ /Ni are +0.80 V and -0.25 V respectively. These electrodes are joined...
- The standard e.m.f. of a cell, involving a two-electron transfer, is found to be 1.182 V at 25^ . The equilibrium constant of the...
- From the data E^ _ Cr_2O_7^ 2- /Cr^ 3+ =1.33 V, E^ _ Cl_2/Cl^- =1.36 V, E^ _ MnO_4^-/Mn^ 2+ =1.51 V, E^ _ Cr^ 3+ /Cr =-0.74 V,...
- How many of the following electrodes can reduce HCl to H_2 ? Cu^ 2+ +2e^- Cu (+0.34 V); Fe^ 2+ +2e^- Fe (-0.44 V); Ni^ 2+ +2e^-...
- The e.m.f. of the cell for the reaction Zn (s)+ Ni^ 2+ (1.0 ,M) Zn^ 2+ (10 ,M)+ Ni (s) is found to be 0.48 V at 298 K. The...
- If a hydrogen electrode were dipped in a solution of pH = 2 at 25^ and 1 bar pressure, the reduction potential of the half-cell...
- The pressure of H_2 required to make the potential of the H_2 -electrode zero in a solution of pH = 3 at 298 K is 10^X bar. The...
- The relationship between the standard reduction potential of a cell (in volts) and the equilibrium constant at 25^ is E^ _ cell =...
- From the following E^ values of half-cells: (1) A+e^- A^-, E^ =-0.24 V; (2) B^-+e^- B^ 2- , E^ =+1.25 V; (3) C^-+2e^- C^ 3- , E^...
- In how many of the following conditions would the reduction potential of the hydrogen half-cell be negative? (1) P( H_2 )=1 atm,...
- At 298 K, the e.m.f. of the electrochemical cell Zn (s)| Zn^ 2+ (10^ -4 ,M)|| Cu^ 2+ (10^ -4 ,M)| Cu (s) will be ________ V....
- If a hydrogen electrode is dipped in two solutions of pH = 4 and pH = 6 at 1 atm pressure and a salt bridge is connected, the...
- The amount of electricity required to prepare 5.4 kg of aluminium from aluminium oxide by electrolysis is X 10^7 C. The value of...
- The potential of a hydrogen electrode at 298 K is -0.0591 V. What is the concentration (in mol ,L^ -1 ) of the acid in the...
- The e.m.f. for the cell Pt | H_2 (P_1) ,|| , H^+ (aq) ,|| , H_2 (P_2)| Pt is given as 2.303RT/F. What is the value of P_1/P_2?
- The conductivity of a 0.1 mol ,L^ -1 KCl solution is 1.41 10^ -3 S ,cm^ -1 . What is its molar conductivity (in S ,cm^2 ,mol^ -1...
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