List of top Chemistry Questions on Fuel Cells

Name the cell which was used in the Apollo space programme for providing electrical power.

Calculate the e.m.f. of the following cell writing the cell reaction: \[ \text{Cu} | \text{Cu}^{2+}(1M) || \text{Ag}^+(1M) | \text{Ag} \] Given: \[ E^0_{\text{Cu}^{2+}/\text{Cu}} = +0.34 \text{ volt}, \quad E^0_{\text{Ag}^+/\text{Ag}} = +0.80 \text{ volt} \]

Find the value of \( E^\circ_{\text{Ce}^{4+}/\text{Ce}^{3+}} \) for the reaction: \[ 2\text{Ce}^{4+} + \text{Co} \rightarrow 2\text{Ce}^{3+} + \text{Co}^{2+} \] Given: \[ E^\circ_{\text{cell}} = 1.89V, \quad E^\circ_{\text{Co}^{2+}/\text{Co}} = -0.28V \]

Draw labelled diagram of H$_2$ - O$_2$ fuel cell. Write two applications of fuel cell.

(b) Calculate emf of the following cell at 25°C: \[ \text{Zn}(s) \, | \, \text{Zn}^{2+} (0.1M) \, || \, \text{Cd}^{2+} (0.01M) \, | \, \text{Cd}(s) \] Given: \[ E^\circ_{\text{Zn}^{2+}/\text{Zn}} = -0.40 \, \text{V}, \quad E^\circ_{\text{Cd}^{2+}/\text{Cd}} = -0.76 \, \text{V}. \]

(b) Calculate emf of the following cell at 25°C: \[ \text{Zn}(s) \, | \, \text{Zn}^{2+} (0.1M) \, || \, \text{Cd}^{2+} (0.01M) \, | \, \text{Cd}(s) \] Given: \[ E^\circ_{\text{Zn}^{2+}/\text{Zn}} = -0.40 \, \text{V}, \quad E^\circ_{\text{Cd}^{2+}/\text{Cd}} = -0.76 \, \text{V}. \]