Which one of the following materials conducts electricity?

During the electrolysis of aqueous $NaCl$ using platinum electrodes,which product is formed at the cathode?

How many moles of electrons are required for the reduction of $1 \ mole$ of $Cr^{3+}$ to $Cr_{(s)}$?

When an electric current is passed through a cell containing an electrolyte,positive ions move towards the cathode and negative ions move towards the anode. If the cathode is removed from the solution,what will happen?

An aqueous solution containing $1 \ M$ each of $Cu(NO_3)_2$,$AgNO_3$,$Hg_2(NO_3)_2$,and $Mg(NO_3)_2$ is electrolyzed using inert electrodes. Given the standard reduction potentials: $E^{\circ}_{Ag^+/Ag} = 0.80 \ V$,$E^{\circ}_{Hg_2^{2+}/2Hg} = 0.79 \ V$,$E^{\circ}_{Cu^{2+}/Cu} = 0.34 \ V$,and $E^{\circ}_{Mg^{2+}/Mg} = -2.37 \ V$. What is the correct order of deposition of metals at the cathode?

When an aqueous solution of cupric bromide is electrolyzed,the product obtained at the cathode will be: