Electrochemistry

Topics in this chapter

• Electrolytic Conductance and Molar Conductivity
• Kohlrausch Law and Ionic Mobility
• Electrolysis and Faraday Laws
• Galvanic Cells and Electrode Potentials
• Nernst Equation, Gibbs Energy and Equilibrium
• Batteries and Fuel Cells

Cheat sheet

Practice questions

1. Question 1Q-1FDF96

   The standard reduction potentials for $M^{2+}/M$ and $N^{2+}/N$ electrodes are $-0.76\text{ V}$ and $+0.34\text{ V}$ respectively. When the two electrodes are connected to form a galvanic cell:

   1. A.M acts as cathode and N acts as anode.
   2. B.M acts as anode and N acts as cathode.
   3. C.Both M and N act as anodes.
   4. D.Both M and N act as cathodes.
   See the answer and solution
2. Question 2Q-286CE8

   Limiting molar conductivity ($\Lambda_m^0$) for $\NaCl$, $\HCl$, and $\CH_3COONa$ are $126.4$, $425.9$, and $91.0\text{ S cm}^2\text{ mol}^{-1}$ respectively. The limiting molar conductivity for $\CH_3COOH$ is:

   1. A.$390.5\text{ S cm}^2\text{ mol}^{-1}$
   2. B.$425.5\text{ S cm}^2\text{ mol}^{-1}$
   3. C.$542.3\text{ S cm}^2\text{ mol}^{-1}$
   4. D.$207.5\text{ S cm}^2\text{ mol}^{-1}$
   See the answer and solution
3. Question 3Q-C3C8F6

   How many faradays of electricity are required to reduce $1\text{ mole}$ of $\MnO_4^-$ to $\Mn^{2+}$ in acidic medium?

   1. A.$1\text{ F}$
   2. B.$3\text{ F}$
   3. C.$5\text{ F}$
   4. D.$7\text{ F}$
   See the answer and solution
4. Question 4Q-3C99DB

   For the cell reaction: $\Zn(s) + Cu^{2+}(aq) \rightarrow Zn^{2+}(aq) + Cu(s)$, the representation of the cell is correctly given as:

   1. A.$Cu(s) | Cu^{2+}(aq) || Zn^{2+}(aq) | Zn(s)$
   2. B.$Zn(s) | Zn^{2+}(aq) || Cu^{2+}(aq) | Cu(s)$
   3. C.$Zn^{2+}(aq) | Zn(s) || Cu(s) | Cu^{2+}(aq)$
   4. D.$Cu^{2+}(aq) | Cu(s) || Zn(s) | Zn^{2+}(aq)$
   See the answer and solution
5. Question 5Q-A1DEDF

   The standard electrode potential ($E^0$) for the $\Daniell$ cell is $1.1\text{ V}$. What is the standard Gibbs energy change ($\Delta G^0$) for the reaction? ($F = 96500\text{ C mol}^{-1}$)

   1. A.$-212.3\text{ kJ mol}^{-1}$
   2. B.$-106.15\text{ kJ mol}^{-1}$
   3. C.$+212.3\text{ kJ mol}^{-1}$
   4. D.$+106.15\text{ kJ mol}^{-1}$
   See the answer and solution