Saturated solution of $KNO_3$ is used to make salt bridge because

Give the cell reaction and symbolic representation of the galvanic cell obtained by $E^o_{Ni^{2+}|Ni} = -0.23 \ V$ and $E^o_{Ag^{+}|Ag} = 0.80 \ V$.

Write a note on lead storage cell (battery).

Consider the figure and answer the questions $(i)$ to $(vi)$ given below.
$(i)$ Redraw the diagram to show the direction of electron flow.
$(ii)$ Is the silver plate the anode or cathode?
$(iii)$ What will happen if the salt bridge is removed?
$(iv)$ When will the cell stop functioning?
$(v)$ How will the concentration of $Zn^{2+}$ ions and $Ag^{+}$ ions be affected when the cell functions?
$(vi)$ How will the concentration of $Zn^{2+}$ ions and $Ag^{+}$ ions be affected after the cell becomes 'dead'?

Write a note on hydrogen-oxygen fuel cell.

Write the chemistry of recharging the lead storage battery,highlighting all the materials that are involved during recharging.