a. | It is also known as the Leclanche cell. |
b. | The electrolyte is a moist paste of ammonium chloride (NH4Cl) and zinc chloride (ZnCl2 ). |
c. | The cathodic reaction is : MnO2 + NH4++ e-→ MnO(OH) + NH3 |
1. | Only a and b are correct | 2. | Only c is correct |
3. | Only b and c are correct | 4. | All are correct |
\(\land^o_m\) for NaCl, HCl and \(\mathrm{CH_3COONa }\) are 126.4, 425.9, and 91.05 S cm2 mol–1 respectively. If the conductivity of 0.001028 mol L–1 acetic acid solution is \(4.95 \times 10^{-5} S ~cm^{-1} \), the degree of dissociation of the acetic acid solution is:
1. | 0.01233 | 2. | 1.00 |
3. | 0.1233 | 4. | 1.233 |
Two half cell reactions are given below:
\(\begin{aligned} &\mathrm{{Co}^{3+}+e^{-} \rightarrow {Co}^{2+}, {E}_{{Co}^{2+} / {Co}^{3+}}^{\circ}=-1.81 {~V}} \\ &2 \mathrm{{Al}^{3+}+6 e^{-} \rightarrow 2 {Al}({s}), {E}_{{Al} / {Al}^{3+}}^{\circ}=+1.66 {~V}} \end{aligned} \)
The standard EMF of a cell with feasible redox reaction will be:
1. | +7.09 V | 2. | +0.15 V |
3. | +3.47 V | 4. | –3.47 V |
1. | –200.27 kJ mol–1 | 2. | –212.27 kJ mol–1 |
3. | –212.27 J mol–1 | 4. | –200.27 J mol–1 |
1. | It consists of zinc-mercury amalgam as anode. |
2. | It consists of a paste of NH4Cl and ZnCl2 as electrolyte. |
3. | It consists of paste of HgO and carbon as cathode. |
4. | It is suitable for low current devices like hearing aids, watches etc. |
1. | When no current is drawn through the cell, the cell potential is called emf of the cell. |
2. | Corrosion of metals is an electrochemical phenomenon. |
3. | Specific conductivity of an electrolytic solution is independent of the concentration of electrolyte. |
4. | In the standard state, the potential of the H-electrode is taken as zero volt. |