Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

Assertion : ECell should have a positive value for the cell to function.


Reason : Ecathode<Eanode


Ecellshouldhave a positive value for the cell to function. As,we know,


ΔrGcell = -nFEcell


Where, ΔrGcell= Gibbs free energy of the reaction.


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


We know, Ecell= Ecathode – Eanode


For reaction to be spontaneous, Ecellshould have a positive value. This is true only when Ecathode>Eanode.

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