What happens to the voltage if the salt bridge is suddenly removed from a working electrochemical cell?

Standard electrode potentials for a few half cells are mentioned below:
$E^0_{Cu^{2+}/Cu} = 0.34 \ V, E^0_{Zn^{2+}/Zn} = -0.76 \ V$
$E^0_{Ag^{+}/Ag} = 0.80 \ V, E^0_{Mg^{2+}/Mg} = -2.37 \ V$
Which one of the following cells gives the most negative value of $\Delta G^0$?

The acid used in lead storage cells is

The standard Gibbs free energy change ($\Delta G^{\circ}$ in $kJ \, mol^{-1}$),in a $Daniell$ cell $(E^{\circ}_{cell} = 1.1 \, V)$,when $2 \, moles$ of $Zn_{(s)}$ is oxidised at $298 \, K$,is closest to

When the lead storage battery is in use (during discharge),the reaction that occurs at the anode is:

Litharge is $NOT$ commonly used in which of the following?