1. Write down the electrode reaction and cell reaction of the following cells.
a) Zn| Zn 2+ (aq) ║ HCl (aq) | H 2 (g), Pt
b) Li(s) │ LiCl(aq) ║ KCl (aq) │Hg 2 Cl 2 (s) │ Hg(l)
c) Pt | Fe 2+ (aq), Fe 3+ (aq) ║ HCl (1M) | H 2 (g), Pt
2. Represent the cell for the following cell reaction.
a) Hg 2 Cl 2 (s) + H 2 (g) 2Hg(l) + 2H + (aq) + 2Cl - (aq)
b) Mg + Hg 2 Cl 2 (s) MgCl 2 (aq) + 2Hg (l)
c) Cu + 2AgNO 3 (aq) Cu(NO 3 ) 2 (aq) + 2Ag
3. Nickel and silver rods are placed in a solution of nickel ion and silver ion solutions of
concentrations 0.4 M and 5.0 M respectively and connected through a salt bridge in the form
of a cell. Represent the cell, write down the cell reaction and calculate its EMF at 25°C. The
standard reduction potentials of the nickel and silver electrodes are +0.23 V and +0.80 V
respectively.
4. Write down the cell reaction and calculate EMF of the following cell at 25°C.
Zn│ Zn 2+ (0.02M) ║ Ag + (4.0M) │ Ag
Given E° Ag+/Ag = +0.8 V and E° Zn 2+ /Zn = -0.76 V
5. What ratio of Pb 2+ /Zn 2+ concentration is needed to reverse the following reaction at 25°C.
Zn + Pb 2+ (aq) == Zn 2+ (aq) + Pb
Given E° Pb2+/Pb = -0.13 V and E° Zn2+/Zn = -0.76 V [Hint: at equilibrium]
6. Write electrode reaction, cell reaction and calculate the EMF of the following cell at 25°C.
Fe | Fe 2+ (0.02 M) || Cu 2+ (0.4M) │ Cu
Given, E° Fe2+/ Fe = -0.44 V and Cu Cu2+/Cu = + 0.34 V
7. Calculate the electrode potential of zinc electrode kept in a solution of zinc ions of 0.45 M
concentration at 30ºC. The standard electrode potential for zinc is -0.76 volts.
8. a) Find the potential of hydrogen electrode at 25°C for solution of pH=0 and pH =14. b) Why
aluminium metal when reacts with acid and base liberates H 2 gas; whereas Fe metal can
liberate H 2 only from acids. E° Al3+/Al = -1.66V and E° Fe2+/Fe = -0.44V. (Hint : at 25 o C, E H+/H2 = -
0591pH)
9. Calculate the equilibrium constant of Daniel cell reaction. Given that E° cell = 1.1 V.
10. Explain the principle of Electroless plating. Write note on Electroless Nickel plating and
Electroless Copper plating.
11. Define conductivity. Explain the determination of conductance of electrolyte solution by
Wheatstone bridge principle.
12. Draw a neat and well labelled diagram for the following
a) Determination of standard electrode potential using calomel electrode
b) Li-ion cell (Write electrode reaction and cell reaction during charging and discharging)
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