(a) Define fuel cell and write its two advantages.

Define fuel cell and write its two advantages.

Using $\displaystyle \mathrm{E}^{\circ}$ values of X and Y given below, predict which is better for coating the surface of Iron to prevent corrosion and why ? Given : $\displaystyle \mathrm{E}_{\mathrm{X}^{2+} / \mathrm{X}}^{\circ}=-2.36 \mathrm{~V}$ \[\begin{aligned} & \mathrm{E}_{\mathrm{Y}^{2+} / \mathrm{Y}}^{\circ}=-0.14 \mathrm{~V} \\ & \mathrm{E}_{\mathrm{Fe}^{2+} / \mathrm{Fe}}^{\circ}=-0.44 \mathrm{~V} \end{aligned} \]