(iii) Assertion is true but the reason is false.

E_cell should have a positive value for the cell to function. As,we know,

Δ_rG_cell = -nFE_cell

Where, Δ_rG_cell = Gibbs free energy of the reaction.

For the proper functioning of the cell, the reaction must be spontaneous, i.e., Δ_rG_cell should have a negative value and this is true only when E_cell have a positive value.

We know, E_cell = E_cathode – E_anode

For reaction to be spontaneous, E_cell should have a positive value. This is true only when E_cathode > E_anode.